http://qudt.org/vocab/quantity#Luminousflux 0 0 Luminous flux Luminous Flux or Luminous Power is the measure of the perceived power of light. It differs from radiant flux, the measure of the total power of light emitted, in that luminous flux is adjusted to reflect the varying sensitivity of the human eye to different wavelengths of light. 0 U1J1 1 QUDT 0 0 Lumen (lm) 0 Photometry 0 0 Space and Time http://qudt.org/vocab/quantity#Solidangle 0 Steradian (sr) 1 The solid angle subtended by a surface S is defined as the surface area of a unit sphere covered by the surface S's projection onto the sphere. A solid angle is related to the surface of a sphere in the same way an ordinary angle is related to the circumference of a circle. Since the total surface area of the unit sphere is 4*pi, the measure of solid angle will always be between 0 and 4*pi. QUDT 0 0 0 U1 Solid angle 0 0 http://qudt.org/vocab/quantity#ThermodynamicTemperature Base Quantity 0 ?1 0 QUDT Kelvin (K) 0 0 1 A temperature is a numerical measure of hot and cold. Its measurement is by detection of heat radiation or particle velocity or kinetic energy, or by the bulk behavior of a thermometric material. It may be calibrated in any of various temperature scales, Celsius, Fahrenheit, Kelvin, etc. The fundamental physical definition of temperature is provided by thermodynamics. Temperature 0 http://qudt.org/schema/qudt#RadiantIntensityUnit Radiology U-1L2M1T-3 Radiant Intensity 2 Watt per steradian (W/sr) QUDT 0 0 -1 1 Radiant flux emitted, reflected, transmitted or received, per unit solid angle. This is a directional quantity. [Wikipedia: https://en.wikipedia.org/wiki/Radiant_intensity] -3 0 0 Kilogram kelvin (kg-K) 0 Mass temperature http://qudt.org/vocab/quantity#Masstemperature QUDT 0 0 Thermodynamics 1 M1?1 1 1 http://dbpedia.org/page/Salinity 0 0 Salinity is the saltiness or dissolved salt content of a body of water. Salinity is an important factor in determining many aspects of the chemistryof natural waters and of biological processes within it, and is a thermodynamic state variable that, along with temperature and pressure, governs physical characteristics like the density and heat capacity of the water. The use of electrical conductivity measurements to estimate the ionic content of seawater led to the development of the so-called practical salinity scale 1978 (PSS-78). Salinities measured using PSS-78 do not have units. The 'unit' of PSU (denoting practical salinity unit) is sometimes added to PSS-78 measurements, however this is officially discouraged. 0 Salinity Wikipedia 0 U1 Practical salinity units (PSU) Chemistry 0 0 Electricity and Magnetism 0 http://qudt.org/vocab/quantity#Lengthperunitmagneticflux -1 0 QUDT L-1M-1T2I1 2 0 -1 Length per magnetic flux per Tesla Meter 1 http://dbpedia.org/page/Gram_per_litre 0 L-3M1 Kilogram per cubic meter (kg/m^3) -3 Concentration or density mass per volume 0 0 1 The mass of one substance per unit volume of another substance. These units are commonly used in both density and concentration measurements Chemistry Wikipedia 0 0 L2M1T-3I-2 Electrical resistance Wikipedia http://dbpedia.org/page/Electrical_resistance_and_conductance 1 0 0 Electricity and Magnetism 2 Ohm (Ohm) Electrical resistance is a ratio of the degree to which an object opposes an electric current through it, measured in ohms. Its reciprocal quantity is electrical conductance measured in siemens. -3 0 -2 QUDT http://qudt.org/vocab/quantity#Specificvolume 0 0 Specific volume Mechanics Specific volume (?) is the volume occupied by a unit of mass of a material. It is equal to the inverse of density. meter cubed per kg L3M-1 0 0 0 3 -1 Mechanics Micromoles per square meter per second (umol/m^2 s) Areal flux is the rate of flow of mass across a unit area per time -1 1 -2 Areal flux 0 0 -1 1 Fluid Mechanics Fluid permeance Permeance is closely related to permeability, but it refers to the extent of penetration of a specific object with given thickness by a liquid or a gas. It is the degee to which a materal or membrane transmits another substance. Units of permeance are volumetric output per unit membrane area per unit trans-membrane pressure. Permeance is also referred to as pressure-normalized flux. 0 0 Kilograms per pascal per second per meter squared Wikipedia 0 L-1T1 0 -4 0 UCUM Pascal seconds per cubic metre (Pa·s/m³) Fluid Mechanics L-4M1T-1 -1 0 In fluid dynamics, drag (sometimes called air resistance, a type of friction, or fluid resistance, another type of friction or fluid friction) refers to forces acting opposite to the relative motion of any object moving with respect to a surrounding fluid. [Wikipedia: https://en.wikipedia.org/wiki/Drag_%28physics%29] 1 Fluid resistance http://unitsofmeasure.org/ucum.html#para-44 0 0 0 http://qudt.org/schema/qudt#ElectricFluxDensityUnit 0 Electricity and Magnetism Electrical flux density 1 -2 L-2T1I1 1 0 QUDT 0 In physics, the electric flux density (or electric displacement field), denoted by D, is a vector field that appears in Maxwell's equations. It accounts for the effects of free and bound charge within materials. "D" stands for "displacement", as in the related concept of displacement current in dielectrics. In free space, the electric displacement field is equivalent to flux density, a concept that lends understanding to Gauss's law. Coulomb per Square Meter (C/m^2) Thermal conductivity -1 Thermodynamics In physics, thermal conductivity (often denoted k, ?, or ?) is the property of a material to conduct heat. Thermal conductivity of materials is temperature dependent. The reciprocal of thermal conductivity is called thermal resistivity. -3 1 http://qudt.org/vocab/quantity#Thermalconductivity Watt per meter kelvin (W/(m*K)) QUDT 0 L1M1T-3?-1 1 0 0 http://qudt.org/vocab/quantity#PowerPerAreaQuarticTemperature Power per area quartic temperature -4 QUDT 1 -3 0 0 Thermodynamics 0 Watt per Square Meter Quartic Kelvin The units of the Stefan-Boltzmann constant. The Stefan–Boltzmann law states that the total energy radiated per unit surface area of a black body across all wavelengths per unit time (also known as the black-body radiant exitance or emissive power), j*, is directly proportional to the fourth power of the black body's thermodynamic temperature. The constant of proportionality ?, called the Stefan–Boltzmann constant or Stefan's constant, derives from other known constants of nature. The value of the constant is5.670373 x 10^8 Wm^-2K^-4. [Wikipedia: https://en.wikipedia.org/wiki/Stefan%E2%80%93Boltzmann_constant] M1T-3?-4 0 Molar angular momentum Chemistry 0 Joule Second per Mole -1 http://qudt.org/vocab/quantity#MolarAngularMomentum 0 The angular momentum per mole of substance. Used for measuring electron orbitals. 0 QUDT 1 -1 2 L2M1T-1N-1 Electrical flux QUDT The Electric Flux through an area is defined as the electric field multiplied by the area of the surface projected in a plane perpendicular to the field. Electric Flux is a scalar-valued quantity. 0 L3M1T-3I-1 1 -1 -3 Volt Meter (Vm) Electricity and Magnetism 0 http://qudt.org/vocab/quantity#ElectricFlux 3 0 1 0 0 Magnetic Flux Per Unit Length 1 L1M1T-2I-1 0 Electricity and Magnetism QUDT Tesla Meter Magnetic flux per length http://qudt.org/vocab/quantity#Magneticfluxperunitlength -2 -1 http://qudt.org/vocab/quantity#Gravitationalattraction QUDT Gravitational attraction -1 L3M-1T-2 Cubic meter per kilogram second squared (m^3/(kg-s^2)) Gravity or gravitation is a natural phenomenon by which all things attract one another including stars, planets, galaxies and even light and sub-atomic particles. Gravity is responsible for the formation of the universe (e.g. creating spheres of hydrogen, igniting them under pressure to form stars and grouping them in to galaxies). Without gravity, the universe would be without thermal energy and composed only of equally spaced particles. On Earth, gravity gives weight to physical objects and causes the tides. Gravity has an infinite range, and it cannot be absorbed, transformed, or shielded against. [Wikipedia: https://en.wikipedia.org/wiki/Gravity] 3 Mechanics -2 0 0 0 0 Electrical dipole moment 1 Electricity and Magnetism L1T1I1 0 0 0 In physics, the electric dipole moment is a measure of the separation of positive and negative electrical charges in a system of electric charges, that is, a measure of the charge system's overall polarity. The SI units are Coulomb-meter (C m). [Wikipedia: https://en.wikipedia.org/wiki/Electric_dipole_moment] http://qudt.org/vocab/quantity#ElectricDipoleMoment 0 Coulomb meter (C-m) 1 1 QUDT 7 -1 0 QUDT Hyperpolarizability http://qudt.org/vocab/quantity#CubicElectricDipoleMomentPerSquareEnergy Cubic Coulomb Cubic Meter Per Square Joule (C3-m3/J2) 0 L-1M-2T7I3 Electricity and Magnetism 3 The hyperpolarizability, a nonlinear-optical property of a molecule, is the second-order electric susceptibility per unit volume. [Wikipedia: https://en.wikipedia.org/wiki/Hyperpolarizability] -2 http://dbpedia.org/page/Hyperpolarizability 0 0 QUDT 0 Energy per area 0 http://qudt.org/vocab/quantity#Energyperarea M1T-2 Energy per area density is the amount of energy stored in a given system or region of space per unit area. Has the same dimensionality as force per unit length. 0 1 Joule per square meter (J/m^2) 0 -2 Mechanics 0 Chemistry 0 In physics and engineering, mass flux is the rate of mass flow per unit area, perfectly overlapping with the momentum density, the momentum per unit volume. The common symbols are j, J, q, Q, ?, or ? (Greek lower or capital Phi), sometimes with subscript m to indicate mass is the flowing quantity. Its SI units are kg s?1 m?2. Mass flux can also refer to an alternate form of flux in Fick's law that includes the molecular mass, or in Darcy's law that includes the mass density. [Wikipedia: https://en.wikipedia.org/wiki/Mass_flux] Mass flux 1 -1 kilograms per meter squared per second (kg/m^2s) L-2M1T-1 0 -2 0 CUAHSI 1 0 Magnetomotive force Electricity and Magnetism 0 0 QUDT 0 http://qudt.org/schema/qudt#MagnetomotiveForceUnit Ampere Turn (At) 0 1 U1I1 Magnetomotive force is any physical cause that produces magnetic flux. In other words, it is a field of magnetism (measured in tesla) that has area (measured in square meters), so that (Tesla)(Area)= Flux. It is analogous to electromotive force or voltage in electricity. MMF usually describes electric wire coils in a way so scientists can measure or predict the actual force a wire coil can generate. [Wikipedia: https://en.wikipedia.org/wiki/Magnetomotive_force] meters cubed per second per meter squared (m^3/s*m^2) 0 0 Has identical dimensionality to linear velocity, but is expressed differently. http://dbpedia.org/page/Volumetric_flux In fluid dynamics, the volumetric flux is the rate of volume flow across a unit area (m3·s?1·m?2). Volumetric flux = liters/(second*area). The density of a particular property in a fluid's volume, multiplied with the volumetric flux of the fluid, thus defines the advective flux of that property. The volumetric flux through a porous medium is often modelled using Darcy's law. Volumetric flux is not to be confused with volumetric flow rate, which is the volume of fluid that passes through a given surface per unit of time (as opposed to a unit surface). [Wikipedia: https://en.wikipedia.org/wiki/Volumetric_flux] Also used for hydraulic conductivity. 0 L1T-1 Mechanics 0 Wikipedia 1 -1 Volumetric flux 0 M-1T1I1 http://qudt.org/vocab/quantity#Electricalchargepermass Coulomb per kilogram (C/kg) 0 0 Electrical charge per mass Unit group for radiation exposure and gyromagnetic ratios 1 0 -1 QUDT Electricity and Magnetism 0 1 ODM2 Working Group ODM2 Units Type Controlled Vocabulary A vocabulary for describing the type of the Unit or the more general quantity that the Unit represents. 0 In electromagnetism, absolute permittivity is the measure of the resistance that is encountered when forming an electric field in a medium. In other words, permittivity is a measure of how an electric field affects, and is affected by, a dielectric medium. The permittivity of a medium describes how much electric field (more correctly, flux) is 'generated' per unit charge in that medium. More electric flux exists in a medium with a low permittivity (per unit charge) because of polarization effects. Permittivity is directly related to electric susceptibility, which is a measure of how easily a dielectric polarizes in response to an electric field. Thus, permittivity relates to a material's ability to resist an electric field and "permit" is a misnomer. In SI units, permittivity ? is measured in farads per meter (F/m) -3 QUDT Farad per meter (F/m) 4 Electricity and Magnetism 0 L-3M-1T4I2 Electrical permittivity http://qudt.org/vocab/quantity#Permittivity 2 -1 0 http://qudt.org/vocab/quantity#EnergyPerAreaElectricCharge QUDT -1 -3 0 Volt per Square Meter 1 Electricity and Magnetism Energy per area electrical charge M1T-3I-1 0 0 0 Magnetic current density? M1T-1 Also known as loading. Kilogram per second (kg/s) 0 1 0 0 0 0 In physics and engineering, mass flow rate is the mass of a substance which passes per unit of time. [Wikipedia: https://en.wikipedia.org/wiki/Mass_flow_rate] http://qudt.org/vocab/quantity#Masspertime QUDT Mechanics Mass per time -1 L2T-3 Absorbed dose per unit time. 0 Absorbed dose rate Radiology 0 -3 QUDT 0 2 http://qudt.org/vocab/quantity#AbsorbedDoseRate 0 0 Gray per second (Gy/s) 0 For stable isotopes, isotope ratios are typically reported using the delta (?) notation where ? represents the ratio of heavy isotope to light isotope in the sample over the same ratio of a standard reference material, reported using units of in "per mil" (‰, parts per thousand) and reported relative to the specific standard reference material. Per Mille (‰; per mil) relative to a standard reference material 0 0 U1 0 Chemistry 0 Stable isotope delta 0 https://en.wikipedia.org/wiki/Isotope_geochemistry#Stable_isotope_geochemistry Wikipedia 1 0 Base Quantity 0 1 http://qudt.org/vocab/quantity#AmountOfSubstance 0 0 Count Mole (mol) 0 0 QUDT N1 Count or amount of substance is a standards-defined quantity that measures the size of an ensemble of elementary entities, such as atoms, molecules, electrons, and other particles. It is a macroscopic property and it is sometimes referred to as chemical amount. The International System of Units (SI) defines the amount of substance to be proportional to the number of elementary entities present. The SI unit for amount of substance is the mole. It has the unit symbol mol. -2 QUDT 0 2 0 Electrical current per energy http://qudt.org/vocab/quantity#Electricalcurrentperunitenergy Ampere per Joule (A/J) Electricity and Magnetism 0 1 -1 L-2M-1T2I1 Has identical dimensionality to Inverse Magnetic Flux 2 1 0 The units of angular mass have dimensions of mass * area. They are used to measure the moment of inertia or rotational inertia. Angular mass 0 Space and Time 0 QUDT 0 L2M1 0 http://qudt.org/schema/qudt#AngularMassUnit Kilogram Meter Squared (kg-m^2) Chemistry 0 -1 Amount of substance or a count/number of items per unit mass. This is most often called molality or molal concentration. This contrasts with the definition of molarity which is based on a specified volume of solution. A commonly used unit for molality used in chemistry is mol/kg. A solution of concentration 1 mol/kg is also sometimes denoted as 1 molal. 1 molal (moles per kg) QUDT http://qudt.org/vocab/quantity#AmountOfSubstancePerUnitMass; http://dbpedia.org/page/Molality 0 0 0 M-1N1 0 Concentration count per mass 0 Wikipedia g/kg 0 0 Mass fraction M1M-1 0 http://dbpedia.org/page/Mass_fraction_(chemistry) 0 0 0 In chemistry, the mass fraction is the ratio of one substance with mass to the mass of the total mixture , defined asThe sum of all the mass fractions is equal to 1:Mass fraction can also be expressed, with a denominator of 100, as percentage by weight (wt%). It is one way of expressing the composition of a mixture in a dimensionless size; mole fraction (percentage by moles, mol%) and volume fraction (percentage by volume, vol%) are others. For elemental analysis, mass fraction (or "mass percent composition") can also refer to the ratio of the mass of one element to the total mass of a compound. It can be calculated for any compound using its empirical formula. or its chemical formula Dimensionless Ratio T-1N1 1 Katal (kat) Chemistry Catalytic activity 0 http://qudt.org/vocab/quantity#CatalyticActivity 0 0 QUDT 0 Uses units that are similar, if not identical, to particle loading. Both have the same dimensionality. -1 0 Catalytic activity is usually denoted by the symbol z and measured in mol/s, a unit which was called katal and defined the SI unit for catalytic activity since 1999. Catalytic activity is not a kind of reaction rate, but a property of the catalyst under certain conditions, in relation to a specific chemical reaction. Catalytic activity of one katal (Symbol 1 kat = 1mol/s) of a catalyst means an amount of that catalyst (substance, in Mol) that leads to a net reaction of one Mol per second of the reactants to the resulting reagents or other outcome which was intended for this chemical reaction. A catalyst may and usually will have different catalytic activity for distinct reactions. [Wikipedia: https://en.wikipedia.org/wiki/Catalysis] 0 0 UCUM Level http://unitsofmeasure.org/ucum.html#para-46 0 0 Decibel (Db) Dimensionless Ratio 0 0 "Psuedo Units" defined from a log ratio. This includes any number of units like deciBels where the unit is derived as a log ratio of two other units. The logarithm distinguishes these from other dimensionless ratios. "Psuedo Units" defined from a log ratio 0 Mole kelvin (mol-K) 1 Temperature count ?1N1 0 http://qudt.org/schema/qudt#AmountOfSubstanceTemperatureUnit 0 0 0 0 Thermodynamics QUDT 1 0 Energy per square magnetic flux density QUDT http://qudt.org/vocab/quantity#EnergyPerSquareMagneticFluxDensity 2 Electricity and Magnetism L2M-1T2I1 2 1 0 -1 0 Joule per Square Tesla (J/T^2) -2 -1 L-2T-1N1 0 moles per meter squared per second 0 CUAHSI 1 Particle flux 0 Chemistry 0 The number of particles, organisms, or moles of substance going through a specific area in a given amount of time. Pascal second (Pa-s) 0 Dynamic viscosity 1 http://qudt.org/vocab/quantity#Dynamicviscosity The dynamic (shear) viscosity of a fluid expresses its resistance to shearing flows, where adjacent layers move parallel to each other with different speeds. Both the physical unit of dynamic viscosity in SI Poiseuille (Pl) and the cgs units Poise (P) come from Jean Léonard Marie Poiseuille. The poiseuille, which is never used, is equivalent to the pascal-second (Pa·s), or (N·s)/m2, or kg/(m·s). L-1M1T-1 Also https://en.wikipedia.org/wiki/Viscosity#Dynamic_viscosity_.CE.BC -1 Fluid Mechanics 0 0 -1 0 QUDT -2 3 -1 Thermal resistance 0 Kelvin per watt (K/W) Thermal resistance is a heat property and a measurement of a temperature difference by which an object or material resists a heat flow. Thermal resistance is the reciprocal of thermal conductance. (Absolute) thermal resistance R in K/W is a property of a particular component. For example, a characteristic of a heat sink. Specific thermal resistance or specific thermal resistivity R? in (K·m)/W is a material constant. 0 Wikipedia Thermodynamics 1 L-2M-1T3?1 0 http://dbpedia.org/page/Thermal_resistance Joule meter 1 0 -2 0 L3M1T-2 0 http://qudt.org/vocab/quantity#Lengthenergy; http://qudt.org/vocab/quantity#ThermalEnergyLength Length energy 0 QUDT redundant with thermalEnergyLength 3 Mechanics 2 QUDT 1 0 Thermodynamics 0 http://qudt.org/vocab/quantity#AreaTimeTemperature Area time temperature L2T1?1 1 0 0 Square Meter Second Kelvin Inverse length temperature -1 0 0 -1 Thermodynamics 0 0 L-1?-1 QUDT 0 per meter Kelvin http://qudt.org/vocab/quantity#Inverselengthtemperature QUDT Mechanics 0 0 Cubic Meter per Second Squared -2 0 L3T-2 0 3 In celestial mechanics, the standard gravitational parameter ? of a celestial body is the product of the gravitational constant G and the mass M of the body. [Wikipedia: https://en.wikipedia.org/wiki/Standard_gravitational_parameter] <http://dbpedia.org/resource/Standard_gravitational_parameter> http://qudt.org/vocab/quantity#StandardGravitationalParameter 0 Standard gravitational parameter 1 http://unitsofmeasure.org/ucum.html#para-48 0 0 UCUM 0 U1 Amount of Information Information Bit 0 0 In computing and telecommunications, a unit of information is the capacity of some standard data storage system or communication channel, used to measure the capacities of other systems and channels. In information theory, units of information are also used to measure the information contents or entropy of random variables. 0 3 Cubic meter per kelvin (m^3/K) L3?-1 0 0 -1 When the temperature of a substance changes, the energy that is stored in the intermolecular bonds between atoms changes. When the stored energy increases, so does the length of the molecular bonds. As a result, solids typically expand in response to heating and contract on cooling; this dimensional response to temperature change is expressed by its coefficient of thermal expansion. Different coefficients of thermal expansion can be defined for a substance depending on whether the expansion is measured by: * linear thermal expansion * area thermal expansion * volumetric thermal expansion These characteristics are closely related. The volumetric thermal expansion coefficient can be defined for both liquids and solids. The linear thermal expansion can only be defined for solids, and is common in engineering applications. Some substances expand when cooled, such as freezing water, so they have negative thermal expansion coefficients. Thermodynamics 0 0 Volume thermal expansion QUDT http://qudt.org/vocab/quantity#Volumethermalexpansion 0 Moles per second per kilogram (mol/s*kg) 0 CUAHSI -1 0 0 Chemistry 1 Mass normalized particle loading 0 -1 The number of particles or organisms per unit time per unit mass. M-1T-1N1 Angle QUDT http://qudt.org/vocab/quantity#Angle 0 U1 0 In geometry, an angle (or plane angle) is the figure formed by two rays or line segments, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Euclid defines a plane angle as the inclination to each other, in a plane, of two lines which meet each other, and do not lie straight with respect to each other. 0 1 Space and Time Radian (rad) 0 0 0 -4 Inverse permittivity QUDT 1 http://qudt.org/vocab/quantity#Inversepermittivity 0 Meter per farad (m/F) 3 0 -2 Electricity and Magnetism 0 L3M1T-4I-2 Length 0 Base Quantity http://qudt.org/vocab/quantity#Length 0 0 In the International System of Quantities, length is any quantity with dimension distance. [Wikipedia: https://en.wikipedia.org/wiki/Length] QUDT 0 meter (m) 0 0 L1 1 QUDT 0 0 Frequency is the number of occurrences of a repeating event per unit time. The repetition of the events may be periodic (i.e. the length of time between event repetitions is fixed) or aperiodic (i.e. the length of time between event repetitions varies). Therefore, we distinguish between periodic and aperiodic frequencies. In the SI system, periodic frequency is measured in hertz (Hz) or multiples of hertz, while aperiodic frequency is measured in becquerel (Bq). -1 T-1 or N1T-1 0 http://qudt.org/vocab/quantity#Frequency 0 0 Hertz (Hz) or Inverse second time (s^-1) 0 Frequency Space and Time -2 Equivalent dose or radiation dosage is a dose quantity used in radiological protection to represent the stochastic health effects (probability of cancer induction and genetic damage) of low levels of ionizing radiation on the human body. It is based on the physical quantity absorbed dose, but takes into account the biological effectiveness of the radiation, which is dependent on the radiation type and energy. [Wikipedia: https://en.wikipedia.org/wiki/Absorbed_dose] 0 QUDT 0 0 2 Absorbed dose, does equivalent, and specific energy all have the same dimensionality. 0 Dose equivalent http://qudt.org/vocab/quantity#DoseEquivalent L2T-2 0 Sievert (Sv) Radiology -1 3 http://qudt.org/schema/qudt#LuminousEfficacyUnit 0 Photometry Luminous Efficacy is the ratio of luminous flux (in lumens) to power (usually measured in watts). Depending on context, the power can be either the radiant flux of the source's output, or it can be the total electric power consumed by the source. 1 QUDT 0 0 Luminous efficacy U1L-2M-1T3J1 -2 Lumen per Watt 0 Polarizability is the relative tendency of a charge distribution, like the electron cloud of an atom or molecule, to be distorted from its normal shape by an external electric field, which may be caused by the presence of a nearby ion or dipole. The electronic polarizability ? is defined as the ratio of the induced dipole moment of an atom to the electric field that produces this dipole moment. Polarizability is often a scalar valued quantity, however in the general case it is tensor-valued. M-1T4I2 <http://dbpedia.org/resource/Polarizability> 0 0 -1 4 2 0 QUDT Polarizability Square Coulomb Meter per Joule Electricity and Magnetism http://qudt.org/vocab/quantity#Polarizability http://qudt.org/vocab/quantity#Inversemagneticflux 0 1 Has identical dimensionality to electric current per unit energy Inverse magnetic flux L-2M-1T2I1 0 2 0 QUDT Electricity and Magnetism Hertz per Volt (Hz/V) -2 -1 http://qudt.org/vocab/quantity#Electricalchargelinedensity 0 0 The linear charge density is the amount of electric charge in a line. It is measured in coulombs per metre (C/m). Since there are positive as well as negative charges, the charge density can take on negative values. [Wikipedia] Electrical charge line density -1 QUDT 0 0 Electricity and Magnetism L-1T1I1 1 1 Coulomb per meter (C/m) Specific radioactivity M-1T-1 0 CUAHSI Quantum Mechanics http://dbpedia.org/page/Specific_activity -1 0 Specific activity is the activity per mass quantity of a radionuclide and is a physical property of that radionuclide. [Wikipedia: https://en.wikipedia.org/wiki/Specific_activity] 0 0 0 -1 Becquerels per gram (Bq/g) Currency Financial http://qudt.org/vocab/quantity#Currency 0 0 QUDT 0 0 Conversions in this unit need access to the latest financial data. United States Dollar A currency (from Middle English: curraunt, "in circulation", from Latin: currens, -entis) in the most specific use of the word refers to money in any form when in actual use or circulation as a medium of exchange, especially circulating banknotes and coins. A more general definition is that a currency is a system of money (monetary units) in common use, especially in a nation. [Wikipedia; https://en.wikipedia.org/wiki/Currency] 0 0 0 -2 1 0 http://qudt.org/vocab/quantity#Forceperlength 0 Newton per meter (N/m) The amount of force applied per unit length. Frequenty used for surface tension. 0 0 0 M1T-2 QUDT Force per length Has the same dimensionality as energy per area. Mechanics Mechanics 0 -1 0 2 QUDT 0 http://qudt.org/vocab/quantity#Inverseenergy per Joule L-2M-1T2 Inverse energy 0 -2 Magnetic flux 0 Electricity and Magnetism L2M1T-2I-1 Weber (Wb) -2 Magnetic Flux is the product of the average magnetic field times the perpendicular area that it penetrates. http://qudt.org/vocab/quantity#Magneticflux 0 QUDT 0 2 1 -1 CUAHSI 0 0 relative fluorescence units (RFU) Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. U1 Fluorescence 0 0 https://en.wikipedia.org/wiki/Fluorescence Dimensionless 0 1 0 QUDT 1 0 0 0 Lumen Second (lm s) 0 http://qudt.org/schema/qudt#LuminousEnergyUnit 1 Photometry In photometry, luminous energy is the perceived energy of light. This is sometimes called the quantity of light. Luminous energy is not the same as radiant energy, the corresponding objective physical quantity. This is because the human eye can only see light in the visible spectrum and has different sensitivities to light of different wavelengths within the spectrum. When adapted for bright conditions (photopic vision), the eye is most sensitive to light at a wavelength of 555 nm. Light with a given amount of radiant energy will have more luminous energy if the wavelength is 555 nm than if the wavelength is longer or shorter. Light whose wavelength is well outside the visible spectrum has a luminous energy of zero, regardless of the amount of radiant energy present. U1T1J1 0 Luminous Energy Electricity and Magnetism L3M1I-2 0 3 Electrical resistivity Wikipedia 1 0 0 -2 0 http://dbpedia.org/page/Electrical_resistivity_and_conductivity Electrical resistivity (also known as resistivity, specific electrical resistance, or volume resistivity) is an intrinsic property that quantifies how strongly a given material opposes the flow of electric current. A low resistivity indicates a material that readily allows the movement of electric charge. Resistivity is commonly represented by the Greek letter ? (rho). The SI unit of electrical resistivity is the ohm?metre (??m)[1][2][3] although other units like ohm?centimetre (??cm) are also in use. [Wikipedia: https://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity] Ohm metres (Ohm m) L-3T1I1 Coulomb per cubic meter (C/m^3) 0 In electromagnetism, charge density is a measure of electric charge per unit volume of space, in one, two or three dimensions. More specifically: the linear, surface, or volume charge density is the amount of electric charge per unit length, surface area, or volume, respectively. The respective SI units are C·m?1, C·m?2 or C·m?3. -3 1 1 Also https://en.wikipedia.org/wiki/Charge_density http://qudt.org/vocab/quantity#Electricalchargevolumedensity 0 0 Electricity and Magnetism QUDT 0 Electrical charge volume density Joule per kilogram (J/kg); Gray (Gy); Sievert (Sv) 0 -2 0 Absorbed dose, does equivalent, and specific energy all have the same dimensionality. Specific energy is energy per unit mass. (It is also sometimes called "energy density," though "energy density" more precisely means energy per unit volume.) The SI unit for specific energy is the joule per kilogram (J/kg). Other units still in use in some contexts are the kilocalorie per gram (Cal/g or kcal/g), mostly in food-related topics, watt hours per kilogram in the field of batteries, and the Imperial unit BTU per pound (BTU/lb), in some engineering and applied technical fields. Specific energy 0 Mechanics 0 L2T-2 2 http://qudt.org/vocab/quantity#Specificenergy QUDT 0 0 1 U1 QUDT 0 0 0 http://qudt.org/vocab/quantity#Turbidity 0 Nephelometric Turbidity Units (NTU) Turbidity is the cloudiness or haziness of a fluid, or of air, caused by individual particles (suspended solids) that are generally invisible to the naked eye, similar to smoke in air. Turbidity in open water is often caused by phytoplankton and the measurement of turbidity is a key test of water quality. The higher the turbidity, the higher the risk of the drinkers developing gastrointestinal diseases, especially for immune-compromised people, because contaminants like virus or bacteria can become attached to the suspended solid. The suspended solids interfere with water disinfection with chlorine because the particles act as shields for the virus and bacteria. Similarly suspended solids can protect bacteria from UV sterilisation of water. Fluids can contain suspended solid matter consisting of particles of many different sizes. While some suspended material will be large enough and heavy enough to settle rapidly to the bottom container if a liquid sample is left to stand (the settleable solids), very small particles will settle only very slowly or not at all if the sample is regularly agitated or the particles are colloidal. These small solid particles cause the liquid to appear turbid. Chemistry 0 Turbidity 0 http://qudt.org/vocab/quantity#Linearacceleration 0 0 Meter per second squared (m/s^2) 1 0 QUDT 0 Linear acceleration Linear acceleration, in physics, is the rate at which the velocity of an object changes over time. Velocity and acceleration are vector quantities, with magnitude and direction that add according to the parallelogram law. The SI unit for acceleration is the metre per second squared (m/s2). Same dimensionality as Thrust to mass ratio Mechanics -2 L1T-2 0 0 -1 Specific heat at a constant pressure. Joule per kilogram kelvin per pascal (J/(km-K-Pa)) 0 -1 http://qudt.org/vocab/quantity#Specificheatpressure 3 Thermodynamics L3M-1?-1 Specific heat pressure 0 QUDT Molar conductivity is defined as the conductivity of an electrolyte solution divided by the molar concentration of the electrolyte, and so measures the efficiency with which a given electrolyte conducts electricity in solution. Its units are siemens per meter per molarity, or siemens meter-squared per mole. The usual symbol is a capital lambda, ?, or ?m. Or Molar conductivity of a solution at a given concentration is the conductance of the volume (V) of the solution containing one mole of electrolyte kept between two electrodes with area of cross section (A) and at a distance of unit length. [Wikipedia: https://en.wikipedia.org/wiki/Molar_conductivity] Siemen Square Meter per Mole (Sm^2/mol) 0 M-1I2N-1 0 0 -1 0 Molar conductivity -1 Aquarius Chemistry 2 Chemistry 0 0 0 Percent (%) 0 0 0 0 Concentration percent saturation The amount of a substance dissolved in a solution compared with the amount dissolved in the solution at saturation concentration, expressed as a percent. -3 http://qudt.org/schema/qudt#ElectricFieldStrengthUnit Volt per Meter (V/m) or Newton per coulomb (N/C) 1 L1M1T-3I-1 0 0 QUDT 1 Electricity and Magnetism Electrical field strength -1 0 The strength of the electric field at a given point is defined as the force that would be exerted on a positive test charge of +1 coulomb placed at that point; the direction of the field is given by the direction of that force. Electric fields contain electrical energy with energy density proportional to the square of the field intensity. The electric field is to charge as gravitational acceleration is to mass and force density is to volume. 1 QUDT -1 Linear thermal expansion 0 When the temperature of a substance changes, the energy that is stored in the intermolecular bonds between atoms changes. When the stored energy increases, so does the length of the molecular bonds. As a result, solids typically expand in response to heating and contract on cooling; this dimensional response to temperature change is expressed by its coefficient of thermal expansion. Different coefficients of thermal expansion can be defined for a substance depending on whether the expansion is measured by: * linear thermal expansion * area thermal expansion * volumetric thermal expansion These characteristics are closely related. The volumetric thermal expansion coefficient can be defined for both liquids and solids. The linear thermal expansion can only be defined for solids, and is common in engineering applications. Some substances expand when cooled, such as freezing water, so they have negative thermal expansion coefficients. [Wikipedia: https://en.wikipedia.org/wiki/Thermal_expansion] 0 http://qudt.org/vocab/quantity#Linearthermalexpansion Thermodynamics 0 0 0 Meter per kelvin (m/K) L1?-1 QUDT L3M1T-2N-1 0 Chemistry 0 -1 3 1 -2 Length molar energy http://qudt.org/vocab/quantity#Lengthmolarenergy Joule meter per mole 0 0 0 0 QUDT 0 U-1I1 1 -1 Electrical current per angle 0 Ampere per radian (A/rad) Electricity and Magnetism http://qudt.org/vocab/quantity#Electricalcurrentperangle 0 http://qudt.org/vocab/quantity#AngularAcceleration Radian per second squared (rad/s^2) U1T-2 Space and Time 1 QUDT -2 0 0 Angular acceleration Angular acceleration is the rate of change of angular velocity over time. Measurement of the change made in the rate of change of an angle that a spinning object undergoes per unit time. It is a vector quantity. Also called Rotational acceleration. In SI units, it is measured in radians per second squared (rad/s^2), and is usually denoted by the Greek letter alpha. 0 0 QUDT 1 -3 U-1L4M1T-3 Watt Square Meter per Steradian 4 1 Mechanics http://qudt.org/vocab/quantity#PowerAreaPerSolidAngle 0 Power area per solid angle 0 0 0 -2 0 Electricity and Magnetism 4 10 -3 Quartic electrical dipole moment per cubic energy Quartic Coulomb Meter per Cubic Joule (C^4 m^4 J^-3) http://qudt.org/vocab/quantity#QuarticElectricDipoleMomentPerCubicEnergy L-2M-3T10I4 QUDT 0 2 0 -1 1 -2 0 Chemistry The amount of energy per mole of substance http://qudt.org/schema/qudt#MolarEnergyUnit Molar energy 0 L2M1T-2N-1 Joule per mole (J/mol) QUDT 1 Potential vorticity Fluid Mechanics Meter squared Kelvin per kilogram per second 2 L2M-1T-1?1 0 0 -1 Potential vorticity (PV) is a quantity which is proportional to the dot product of vorticity and stratification that, following a parcel of air or water, can only be changed by diabatic or frictional processes. It is a useful concept for understanding the generation of vorticity in cyclogenesis (the birth and development of a cyclone), especially along the polar front, and in analyzing flow in the ocean. [Wikipedia: https://en.wikipedia.org/wiki/Potential_vorticity] 0 -1 http://dbpedia.org/page/Potential_vorticity UDUnits 0 http://qudt.org/vocab/quantity#MassAmountOfSubstance 1 0 QUDT Mass count 0 0 M1N1 1 kilogram mole (kg*mol) 0 Chemistry 0 Has identical dimensionality to pressure or stress 0 -1 Joule per cubic meter (J/m^3) http://qudt.org/vocab/quantity#Energydensity 1 Energy density is the amount of energy stored in a given system or region of space per unit volume or mass, though the latter is more accurately termed specific energy. Energy density 0 Mechanics L-1M1T-2 0 -2 QUDT 0 The magnetic field strength, H (also called magnetic field intensity, magnetizing field, or magnetic field), characterizes how the true Magnetic Field B influences the organization of magnetic dipoles in a given medium. http://qudt.org/schema/qudt#MagneticFieldStrengthUnit 1 -1 0 0 0 Ampere Turn per Meter (At/m) or Ampere per meter (A/m) L-1I1 Electricity and Magnetism Magnetic field strength QUDT 0 0 QUDT -2 0 http://qudt.org/vocab/quantity#Volumetricheatcapacity Volumetric heat capacity (VHC), also termed volume-specific heat capacity, describes the ability of a given volume of a substance to store internal energy while undergoing a given temperature change, but without undergoing a phase transition. It is different from specific heat capacity in that the VHC is a 'per unit volume' measure of the relationship between thermal energy and temperature of a material, while the specific heat is a 'per unit mass' measure (or occasionally per molar quantity of the material). Joule per cubic meter kelvin (J/(m^3 K)) L-1M1T-2?-1 1 -1 Volumetric heat capacity -1 0 Thermodynamics Thermodynamics QUDT -1 The specific heat capacity, often simply called specific heat, is the heat capacity per unit mass of a material. It is the amount of heat needed to raise the temperature of a certain mass 1 degree Celsius. 0 http://qudt.org/vocab/quantity#Specificheatcapacity Specific heat capacity 0 0 2 Joule per kilogram kelvin (J/(kg-K)) 0 -2 L2T-2?-1 0 Uses units that are similar, if not identical, to catalytic activity. Both have the same dimensionality. 0 Number per second (#/s) 0 -1 0 T-1N1 Particle loading CUAHSI 1 The number of particles, organisms, or moles of substance appearing in a given amount of time. Chemistry 0 U1L2 Area angle 0 2 Square meter steradian (m^2-sr) Space and Time 1 0 0 http://qudt.org/vocab/quantity#AreaAngle QUDT 0 0 Space and Time -3 L-3 0 Inverse volume 0 per cubic meter 0 This should only be used for quantities with a truly dimensionless numerator. For other concentrations and densities, use "Concentration count per volume." 0 http://qudt.org/vocab/quantity#Inversevolume 0 0 QUDT -1 T-1?1 QUDT 1 Kelvin per second (K/s) 0 Thermodynamics 0 0 http://qudt.org/vocab/quantity#TemperaturePerTime 0 0 Temperature per time Space and Time 0 Inverse length 0 http://qudt.org/vocab/quantity#Inverselength QUDT per meter 0 The inverse of length - frequently used for absorption or attenuation coefficients and wave numbers. This can also be used to for extrinsic curvature where the unit 'diopter' is used. 0 L-1 This should not be used for linear densities, but only for quantities with a truly dimensionless numerator. For linear densities, use "Count per length" -1 0 0 0 Magnetic permeability http://qudt.org/schema/qudt#PermeabilityUnit Henry per meter (H/m) Electricity and Magnetism 1 -2 QUDT L1M1T-2I-2 Permeability is the degree of magnetization of a material that responds linearly to an applied magnetic field. In general permeability is a tensor-valued quantity. -2 0 0 1 0 0 0 Electricity and Magnetism QUDT Electric current density is a measure of the density of flow of electric charge; it is the electric current per unit area of cross section. Electric current density is a vector-valued quantity. 0 L-2I1 http://qudt.org/vocab/quantity#Electricalcurrentdensity -2 0 Electrical current density 1 Ampere per square meter (A/m^2) The reciprocal of thermal conductivity is thermal resistivity, measured in kelvin-metres per watt (K*m/W). Also called Specific Thermal Resistance. -1 1 0 Meter Kelvin per watt (K-m/W) 0 Thermal resistivity http://qudt.org/vocab/quantity#Thermalresistivity 0 -1 3 L-1M-1T3?1 QUDT Thermodynamics 0 N1N-1 0 Dimensionless Ratio 0 0 Concentration count per count 0 New for ODM2 0 0 mole per mole The count of one substance per unit count of another substance, also known as mole fraction or numeric concentration. A unit that does not belong in any of the other groups. These units have dimensionality, but are generally strangely compounded or calculated 0 Catch-all for units I don't know how to deal with Dimensionless Other 0 0 New for ODM2 0 0 0 0 M1 kilogram (kg) http://qudt.org/vocab/quantity#Mass In physics, mass is a property of a physical body which determines the strength of its mutual gravitational attraction to other bodies, its resistance to being accelerated by a force, and in the theory of relativity gives the mass–energy content of a system. The SI unit of mass is the kilogram (kg). Base Quantity 0 0 0 0 0 QUDT 0 Mass 1 Fluidity 1 0 0 UDUnits ftp://ftp.unidata.ucar.edu/pub/udunits/ L1M-1T1 Fluid Mechanics 0 -1 0 Per Pascal Second (1/Pa·s) The reciprocal of viscosity is fluidity, usually symbolized by ? = 1 / ? or F = 1 / ?, depending on the convention used, measured in reciprocal poise (cm·s·g?1), sometimes called the rhe. Fluidity is seldom used in engineering practice. [Wikipedia: https://en.wikipedia.org/wiki/Viscosity] 1 0 U1T-1 Bits per Second (pbs) http://qudt.org/schema/qudt#DataRateUnit -1 Information 1 Data rate 0 0 0 The frequency derived from the period of time required to transmit one bit. This represents the amount of data transferred per second by a communications channel or a computing or storage device. Data rate is measured in units of bits per second (written "b/s" or "bps"), bytes per second (Bps), or baud. When applied to data rate, the multiplier prefixes "kilo-", "mega-", "giga-", etc. (and their abbreviations, "k", "M", "G", etc.) always denote powers of 1000. For example, 64 kbps is 64,000 bits per second. This contrasts with units of storage which use different prefixes to denote multiplication by powers of 1024, e.g. 1 kibibit = 1024 bits. QUDT 0 0 Electrical conductivity -3 0 L-3M-1T3I2 -1 Electrical conductivity or specific conductance is the reciprocal of electrical resistivity, and measures a material's ability to conduct an electric current. It is commonly represented by the Greek letter ? (sigma), but ? (kappa) (especially in electrical engineering) or ? (gamma) are also occasionally used. Its SI unit is siemens per metre (S/m) and CGSE unit is reciprocal second (s?1). [Wikipedia: https://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity] microsiemens per centimeter (µS/cm) http://dbpedia.org/page/Electrical_resistivity_and_conductivity 3 Wikipedia Electricity and Magnetism 2 0 A type of Linear Density. 0 http://dbpedia.org/page/Linear_density 0 Area per length L2L-1 Aquarius 1 0 Space and Time meters squared per meter (m^2/m) 0 0 0 1 -4 0 0 L1T-4 In physics, jounce or snap is the fourth derivative of the position vector with respect to time, with the first, second, and third derivatives being velocity, acceleration, and jerk, respectively; hence, the jounce is the rate of change of the jerk with respect to time. [Wikipedia: https://en.wikipedia.org/wiki/Jounce] Aquarius 0 Mechanics Meters per quartic second (m/s^4) 0 0 Snap http://qudt.org/vocab/quantity#Lengthmass 0 Mechanics 0 0 0 Meter kilogram (m-kg) QUDT 1 Length mass L1M1 1 0 -2 0 0 Electricity and Magnetism -2 Henry (H) http://qudt.org/vocab/quantity#Inductance QUDT 1 Inductance 0 L2M1T-2I-2 Inductance is an electromagentic quantity that characterizes a circuit's resistance to any change of electric current; a change in the electric current through induces an opposing electromotive force (EMF). Quantitatively, inductance is proportional to the magnetic flux per unit of electric current. 2 QUDT 1 The amount of electrical charge within a given count of something. 0 1 Coulomb per mole (C/mol) Electricity and Magnetism 0 0 -1 http://qudt.org/vocab/quantity#Electricalchargepercount T1I1N-1 Electrical charge per count 0 Energy In physics, energy is a property of objects which can be transferred to other objects or converted into different forms, but cannot be created or destroyed. Energy, work, and heat all have identical units. 0 Space and Time -2 2 QUDT 1 0 http://qudt.org/schema/qudt#EnergyAndWorkUnit 0 Has the same dimensionality as torque 0 L2M1T-2 Joule (J) Volumetric productivity 1 In ecology, productivity or production refers to the rate of generation of biomass in an ecosystem. It is usually expressed in units of mass per unit surface (or volume) per unit time, for instance grams per square metre per day (g m?2 d?1). The mass unit may relate to dry matter or to the mass of carbon generated. Productivity of autotrophs such as plants is called primary productivity, while that of heterotrophs such as animals is called secondary productivity. [Wikipedia: https://en.wikipedia.org/wiki/Productivity_%28ecology%29] 0 Kilograms per cubic meter per second Chemistry -1 0 -3 L-3M1T-1 CUAHSI 0 0 Velocity is the rate of change of the position of an object, equivalent to a specification of its speed and direction of motion.Velocity is an important concept in kinematics, the branch of classical mechanics which describes the motion of bodies.Velocity is a vector physical quantity; both magnitude and direction are required to define it. The scalar absolute value (magnitude) of velocity is called "speed", a quantity that is measured in metres per second (m/s or m·s?1) in the SI (metric) system. This has the same dimensionality as volumetric flux, but is expressed differently. L1T-1 Mechanics 1 http://qudt.org/vocab/quantity#Linearvelocity Meter per second (m/s) 0 0 -1 Linear velocity 0 0 QUDT 0 0 0 http://qudt.org/vocab/quantity#Activity Quantum Mechanics 0 QUDT 0 -1 Radioactivity 0 T-1 Activity is the term used to characterise the number of nuclei which disintegrate in a radioactive substance per unit time. Activity is usually measured in Becquerels (Bq), where 1 Bq is 1 disintegration per second. 0 Becquerel (Bq) 0 Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. The SI derived unit of electric charge is the coulomb (C), although in electrical engineering it is also common to use the ampere-hour (Ah), and in chemistry it is common to use the elementary charge (e) as a unit. The symbol Q is often used to denote charge. [Wikipedia: https://en.wikipedia.org/wiki/Electric_charge] Coulomb (C) Electrical charge Electricity and Magnetism 0 1 1 0 http://qudt.org/vocab/quantity#ElectricCharge T1I1 0 0 QUDT QUDT 0 0 0 3 0 Space and Time 0 http://qudt.org/vocab/quantity#LiquidVolume This includes dry, liquid, and gas volumes. 0 Volume L3 Cubic Meter (m^3) Watt per square meter (W/m^2) A general term for heat flow rate per unit area, power per unit area, irradiance, radient emmitance, and radiosity. All these terms are sometimes referred to as "intensity." 0 QUDT 0 0 M1T-3 1 http://qudt.org/vocab/quantity#Powerperarea Mechanics 0 0 -3 Power per area http://qudt.org/vocab/quantity#AbsorbedDose 0 2 0 0 QUDT 0 Radiology Gray (Gy) -2 Absorbed dose, does equivalent, and specific energy all have the same dimensionality. Absorbed dose (also known as Total Ionizing Dose, TID) is a measure of the energy deposited in a medium by ionizing radiation. It is equal to the energy deposited per unit mass of medium, and so has the unit J/kg, which is given the special name Gray (Gy). Note that the absorbed dose is not a good indicator of the likely biological effect. 1 Gy of alpha radiation would be much more biologically damaging than 1 Gy of photon radiation for example. Appropriate weighting factors can be applied reflecting the different relative biological effects to find the equivalent dose. The risk of stoctic effects due to radiation exposure can be quantified using the effective dose, which is a weighted average of the equivalent dose to each organ depending upon its radiosensitivity. When ionising radiation is used to treat cancer, the doctor will usually prescribe the radiotherapy treatment in Gy. When risk from ionising radiation is being discussed, a related unit, the Sievert is used. 0 L2T-2 Absorbed dose http://qudt.org/vocab/quantity#MolarMass M1N-1 kilogram per mol (kg/mol) 0 Molar mass 0 QUDT 1 0 0 <http://dbpedia.org/resource/Molar_mass> -1 0 In chemistry, the molar mass M is a physical property defined as the mass of a given substance (chemical element or chemical compound) divided by its amount of substance. The base SI unit for molar mass is kg/mol. However, for historical reasons, molar masses are almost always expressed in g/mol. [Wikipedia: https://en.wikipedia.org/wiki/Molar_mass] Chemistry Amount of substance or a count/number of items per unit volume. Concentration impliles the amount of one substance/item within another substance. 0 0 L-3N1 0 Mole per cubic meter (mol/m^3) or per cubic meter (1/m^3) Concentration count per volume QUDT -3 0 http://qudt.org/vocab/quantity#AmountOfSubstancePerUnitVolume 1 Distinct from inverse volume in that there is something specific being counted within each unit volume. Inverse volume implies a truly dimensionless numerator. Chemistry 0 0 Mass per area http://qudt.org/vocab/quantity#Massperarea 0 0 QUDT 0 Chemistry -2 L-2M1 1 Kilogram per square meter (kg/m^2) Has same dimensionality as length integrated mass concentration 0 Aquarius L-1N1 0 1 0 0 -1 Count per meter (#/m) Space and Time 0 The length density of a given amount of a substance. This unit group is also used for image and TV resolutions measured in lines. This is distinct from "inverse length" in that there is something specific being counted per unit length, that is, the numerator is not dimensionless. Count per length 0 L2M-1 0 0 -1 Specific surface area "SSA" is a property of solids which is the total surface area of a material per unit of mass. It is a derived scientific value that can be used to determine the type and properties of a material (e.g. soil, snow). It is defined by surface area divided by mass (with units of m²/kg). Mechanics 0 Wikipedia Meters squared per kilogram (m²/kg) http://dbpedia.org/page/Specific_surface_area 0 0 2 Specific surface area 0 Power per electrical charge http://qudt.org/vocab/quantity#PowerPerElectricCharge -4 -1 L2M1T-4I-1 1 0 2 Electricity and Magnetism QUDT 0 Volt per Second 1 1 0 1 Meter Second Kelvin http://qudt.org/vocab/quantity#Lengthtemperaturetime 0 Thermodynamics L1T1?1 Length temperature time 0 0 QUDT Photometry 0 Candela per square meter (cd/m^2) 0 QUDT Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle. 0 -2 0 0 L-2J1 Luminance 0 http://qudt.org/vocab/quantity#Luminance U1 pH 0 0 http://environment.data.gov.au/def/unit/pH Chemistry 0 pH 1 In chemistry, pH (/pi??e?t?/) is a numeric scale used to specify the acidity or alkalinity of an aqueous solution. It is the negative of the logarithm to base 10 of the activity of the hydrogen ion. Solutions with a pH less than 7 are acidic and solutions with a pH greater than 7 are alkaline or basic. Pure water is neutral, being neither an acid nor a base. Contrary to popular belief, the pH value can be less than 0 or greater than 14 for very strong acids and bases respectively. [Wikipedia: https://en.wikipedia.org/wiki/PH] 0 0 0 QUDT-WQ Molar heat capacity Thermodynamics QUDT The molar heat capacity is the heat capacity per unit amount of a pure substance. [Wikipedia: https://en.wikipedia.org/wiki/Heat_capacity] 0 1 -1 0 -2 http://qudt.org/schema/qudt#MolarHeatCapacityUnit Joule per mole kelvin (J/(mol-K)) 2 -1 L2M1T-2?-1N-1 L-2M-1T4I2 -1 -2 0 Farad (F) Electricity and Magnetism QUDT 2 Capacitance is the ability of a body to store an electrical charge. 0 0 4 http://qudt.org/vocab/quantity#Capacitance Electrical capacitance Linear energy transfer -2 1 0 Linear energy transfer (LET) is a term used in dosimetry. It describes the action of radiation upon matter. It is identical to the retarding force acting on a charged ionizing particle travelling through the matter. It describes how much energy an ionising particle transfers to the material transversed per unit distance. By definition, LET is a positive quantity. LET depends on the nature of the radiation as well as on the material traversed. [Wikipedia: https://en.wikipedia.org/wiki/Linear_energy_transfer] 1 Atomic Physics Joules per meter (J/m) L1M1T-2 http://qudt.org/vocab/quantity#LinearEnergyTransfer Has identical dimensionality to force, but is generally expressed differently. https://en.wikipedia.org/wiki/Linear_energy_transfer 0 QUDT 0 0 QUDT 0 -2 0 0 http://qudt.org/vocab/quantity#Illuminance 1 0 U1L-2J1 Illuminance Illuminance (also know as luminous emittance or luminous flux per area), is the total luminous flux incident on a surface, per unit area. It is a measure of the intensity of the incident light, wavelength-weighted by the luminosity function to correlate with human brightness perception. Lux (lx); Lumen per square meter (lm/m^2) Photometry 0 0 Thrust to mass ratio Same dimensionality as linear accelleration -2 0 0 L1T-2 0 1 QUDT Thrust-to-weight ratio is a dimensionless ratio of thrust to weight of a rocket, jet engine, propeller engine, or a vehicle propelled by such an engine that indicates the performance of the engine or vehicle. [Wikipedia: https://en.wikipedia.org/wiki/Thrust-to-weight_ratio] http://qudt.org/vocab/quantity#ThrustToMassRatio Mechanics 0 Newton per kilogram (N/kg) -1 QUDT Angular velocity or frequency 0 0 0 http://qudt.org/vocab/quantity#AngularVelocity The change of angle per unit time; specifically, in celestial mechanics, the change in angle of the radius vector per unit time. Angular frequency is a scalar measure of rotation rate. It is the magnitude of the vector quantity angular velocity. Angular frequency uses the same units as that of angular velocity. 0 U1T-1 Radian per second (rad/s) 0 Space and Time 1 0 QUDT Electricity and Magnetism 2 -2 Siemens (S) -1 L-2M-1T3I2 Electrical conductance http://qudt.org/schema/qudt#ConductanceUnit 0 Conductance is the reciprocal of resistance and is different from conductivitiy (specific conductance). Conductance is the ease with which an electric current passes through a conductor. The SI unit of electrical resistance is the ohm (?), while electrical conductance is measured in siemens (S). [Wikipedia: https://en.wikipedia.org/wiki/Electrical_resistance_and_conductance] 3 0 Kilogram Meter Per Second (kg-m/s) 1 0 L1M1T-1 QUDT http://qudt.org/vocab/quantity#Linearmomentum -1 0 0 Linear momentum In classical mechanics, linear momentum or translational momentum (pl. momenta; SI unit kg m/s, or equivalently, N s) is the product of the mass and velocity of an object. 1 Mechanics 0 Mechanics 0 QUDT http://qudt.org/vocab/quantity#AngularMomentum 0 1 -1 0 Angular momentum 2 Quantity of rotational motion. Linear momentum is the quantity obtained by multiplying the mass of a body by its linear velocity. Angular momentum is the quantity obtained by multiplying the moment of inertia of a body by its angular velocity. The momentum of a system of particles is given by the sum of the momenta of the individual particles which make up the system or by the product of the total mass of the system and the velocity of the center of gravity of the system. The momentum of a continuous medium is given by the integral of the velocity over the mass of the medium or by the product of the total mass of the medium and the velocity of the center of gravity of the medium. In physics, the angular momentum of an object rotating about some reference point is the measure of the extent to which the object will continue to rotate about that point unless acted upon by an external torque. In particular, if a point mass rotates about an axis, then the angular momentum with respect to a point on the axis is related to the mass of the object, the velocity and the distance of the mass to the axis. While the motion associated with linear momentum has no absolute frame of reference, the rotation associated with angular momentum is sometimes spoken of as being measured relative to the fixed stars. The physical quantity "action" has the same units as angular momentum. 0 Joule Second (J s) L2M1T-1 0 new for ODM2 0 Dimensionless Ratio The volume of one substance per unit volume of another substance. This is used for volume percents or the ppm of a gas mixture. 0 0 0 0 Concentration volume per volume unitless 0 L3L-3 -2 0 QUDT http://qudt.org/vocab/quantity#Specificheatvolume L-1T-2?-1 Joule per kilogram kelvin per cubic meter (J/(kg-K-m^3)) 0 0 0 -1 Thermodynamics Specific heat per constant volume. Specific heat volume -1 0 Space and Time http://qudt.org/vocab/quantity#Area QUDT Area 0 Square meter (m^2) 0 0 0 2 0 L2 Area is a quantity expressing the two-dimensional size of a defined part of a surface, typically a region bounded by a closed curve. -1 0 -2 Has identical dimensionality to energy density Pressure is an effect which occurs when a force is applied on a surface. Pressure is the amount of force acting on a unit area. Pressure is distinct from stress, as the former is the ratio of the component of force normal to a surface to the surface area. Stress is a tensor that relates the vector force to the vector area. Pascal (Pa) Space and Time Pressure or stress L-1M1T-2 0 1 0 0 http://qudt.org/vocab/quantity#Pressureorstress QUDT 0 http://qudt.org/vocab/quantity#Torque L2M1T-2 QUDT Newton meter (N-m) Torque 2 Has the same dimensionality as energy/work 0 0 1 -2 Mechanics 0 In physics, a torque (?) is a vector that measures the tendency of a force to rotate an object about some axis [1]. The magnitude of a torque is defined as force times its lever arm [2]. Just as a force is a push or a pull, a torque can be thought of as a twist. The SI unit for torque is newton meters (N m). In U.S. customary units, it is measured in foot pounds (ft lbf) (also known as 'pounds feet'). Mathematically, the torque on a particle (which has the position r in some reference frame) can be defined as the cross product: ? = r x F where r is the particle's position vector relative to the fulcrum F is the force acting on the particles, or, more generally, torque can be defined as the rate of change of angular momentum, ? = dL/dt where L is the angular momentum vector t stands for time. 0 http://qudt.org/vocab/quantity#Inversesquareenergy L-4M-2T4 Inverse square energy Mechanics -2 -4 per square Joule (J-2) 0 QUDT 0 0 4 0 0 L2M1T-3I-1 1 http://qudt.org/vocab/quantity#Electromotiveforce -3 -1 Volt (V) = Joule per coulomb Electricity and Magnetism 2 In physics, electromotive force, or most commonly emf (seldom capitalized), voltage, or (occasionally) electromotance is "that which tends to cause current (actual electrons and ions) to flow.". More formally, emf is the external work expended per unit of charge to produce an electric potential difference across two open-circuited terminals.[2][3] The electric potential difference is created by separating positive and negative charges, thereby generating an electric field.[4][5] The created electrical potential difference drives current flow if a circuit is attached to the source of emf. When current flows, however, the voltage across the terminals of the source of emf is no longer the open-circuit value, due to voltage drops inside the device due to its internal resistance. [Wikipedia: https://en.wikipedia.org/wiki/Electromotive_force] Electromotive force QUDT 0 0 1 Meter kelvin (m-K) 0 0 Thermodynamics 0 Length temperature QUDT L1?1 0 http://qudt.org/schema/qudt#LengthTemperatureUnit 1 In remote sensing, a satellite's resolution is defined as the size on the earth of the smallest individual component or dot (called a pixel) from which the image is constituted. This is also reffered to as the ground sample distance. CUAHSI 0 1 Satellite resolution Space and Time -1 L1N-1 0 0 0 0 meter per pixel QUDT Watt per square meter steradian (W/(m^2-sr)) -1 0 0 1 http://qudt.org/schema/qudt#RadianceUnit Radiance 0 0 -3 U-1M1T-3 Radiology In radiometry, radiance is the radiant flux emitted, reflected, transmitted or received by a surface, per unit solid angle per unit projected area. Radiance is used to characterize diffuse emission and reflection of electromagnetic radiation, or to quantify emission of neutrinos and other particles. This is a directional quantity. Historically, radiance is called "intensity" and spectral radiance is called "specific intensity". [Wikipedia: https://en.wikipedia.org/wiki/Radiance] 2 http://qudt.org/vocab/quantity#Heatcapacity 0 QUDT 1 Joule per kelvin (J/K) -2 Heat capacity -1 Thermodynamics L2M1T-2?-1 Heat capacity, or thermal capacity, is a measurable physical quantity equal to the ratio of the heat added to (or removed from) an object to the resulting temperature change. The SI unit of heat capacity is joule per kelvin and the dimensional form is L2MT?2??1. [Wikipedia: https://en.wikipedia.org/wiki/Heat_capacity] 0 0 0 0 Square meter Kelvin per watt (K(m^2)/W) -1 1 Thermal insulance 3 http://qudt.org/vocab/quantity#Thermalinsulance QUDT Thermodynamics 0 0 M-1T3?1 The inverse of the heat transfer coefficient. Space and Time Aquarius Count per area 0 0 The areal density of a given amount of a substance. This unit group is also used for pixel densities (often incorrectly called resolution). 0 0 L-2N1 0 Count per square meter (#/m^2) -2 1 -3 -1 L-3T-1 New for ODM2 Radioactivity per volume 0 Quantum Mechanics 0 0 0 The amount of radioactivity per unit volume Becquerels per meter cubed (Bq/m^3) 0 0 0 Mechanics 0 Mass per length -1 0 http://qudt.org/vocab/quantity#Massperlength 1 L-1M1 Kilogram per meter (kg/m) QUDT 0 0 1 QUDT 0 <http://dbpedia.org/resource/Quadrupole> 1 Electrical quadrupole moment 0 0 2 http://qudt.org/vocab/quantity#ElectricQuadrupoleMoment The Electric Quadrupole Moment is a quantity which describes the effective shape of the ellipsoid of nuclear charge distribution. A non-zero quadrupole moment Q indicates that the charge distribution is not spherically symmetric. By convention, the value of Q is taken to be positive if the ellipsoid is prolate and negative if it is oblate. In general, the electric quadrupole moment is tensor-valued. L2T1I1 Electricity and Magnetism Coulomb square meter (C-m^2) M1?1N1 0 Mass count temperature 1 0 1 Kilogram mole Kelvin (kg*mol*K) QUDT 1 Chemistry 0 0 http://qudt.org/vocab/quantity#MassAmountOfSubstanceTemperature 3 The molar volume, symbol Vm, is the volume occupied by one mole of a substance (chemical element or chemical compound) at a given temperature and pressure. It is equal to the molar mass (M) divided by the mass density (?). [Wikipedia: https://en.wikipedia.org/wiki/Molar_volume] 0 0 -1 Molar volume L3N-1 0 New for ODM2 http://dbpedia.org/page/Molar_volume Chemistry 0 cubic meters per mol (m^3/mol) 0 0 QUDT 1 Square meter second (m^2 s) http://qudt.org/vocab/quantity#AreaTime 2 0 0 L2T1 0 Area time 0 Space and Time L2?1 0 Thermodynamics Area temperature 0 0 QUDT http://qudt.org/schema/qudt#AreaTemperatureUnit Square meter kelvin (m^2-K) 1 0 2 0 QUDT Pressure or stress rate -3 Space and Time Pascal per second (Pa/s) http://qudt.org/schema/qudt#PressureOrStressRateUnit 0 1 0 L-1M1T-3 -1 0 0 Hertz per Kelvin (Hz/K) Thermodynamics 0 0 0 -1 -1 Inverse time temperature http://qudt.org/vocab/quantity#Inversetimetemperature 0 QUDT 0 T-1?-1 0 L3T-1 3 0 http://qudt.org/vocab/quantity#Volumepertime Volumetric flow rate 0 Cubic meter per second (m^3/s) QUDT 0 -1 Mechanics Volume Per Unit Time, or Volumetric flow rate, is the volume of fluid that passes through a given surface per unit of time (as opposed to a unit surface). 0 0 -1 2 0 0 L2T-1 0 Fluid Mechanics Used for kinematic viscosity (also known as momentum diffusivity) and thermal diffusivity. The Kinematic Viscosity of a fluid is the dynamic viscosity divided by the fluid density. In heat transfer analysis, thermal diffusivity (usually denoted ? but a, ?, and D are also used) is the thermal conductivity divided by density and specific heat capacity at constant pressure. It measures the ability of a material to conduct thermal energy relative to its ability to store thermal energy. Encompases both kinematic viscosity and thermal diffusivity Diffusivity 0 Square meter per second (m^2/sec) new for ODM2 second (s) 0 0 0 QUDT T1 http://qudt.org/vocab/quantity#Time Time is a basic component of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify the motions of objects. 0 Time 1 0 Base Quantity 0 -1 0 Tesla (T) Magnetic flux density Electricity and Magnetism QUDT 0 0 -2 0 M1T-2I-1 The Magnetic flux density, B (also called magnetic induction or magnetic field), is a fundamental field in electrodynamics which characterizes the magnetic force exerted by electric currents. It is closely related to the auxillary magnetic field H. 1 http://qudt.org/schema/qudt#MagneticFluxDensityUnit http://qudt.org/vocab/quantity#PowerArea L4M1T-3 -3 0 QUDT 0 0 0 Watt Square Meter Power area 4 Mechanics 1 Base Quantity 0 J1 0 0 Luminous Intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle. The weighting is determined by the luminosity function, a standardized model of the sensitivity of the human eye to different wavelengths. 0 0 0 Candela (cd) Luminous intensity http://qudt.org/vocab/quantity#Luminousintensity QUDT 0 unitless 0 Length fraction 0 0 Space and Time 0 The ratio or two lengths, often used to measure slope or scale. 0 CSN 0 L1L-1 0 0 L1M1T-2 1 -2 1 Newton (N) Mechanics 0 Force Force is an influence that causes mass to accelerate. It may be experienced as a lift, a push, or a pull. Force is defined by Newton's Second Law as F = m · a, where F is force, m is mass and a is acceleration. Net force is mathematically equal to the time rate of change of the momentum of the body on which it acts. Since momentum is a vector quantity (has both a magnitude and direction), force also is a vector quantity. http://qudt.org/vocab/quantity#Force 0 QUDT 0 kilograms per meter cubed per meter L-2M1 http://his.cuahsi.org/mastercvreg/edit_cv11.aspx?tbl=Units&id=1125579048 0 Length integrated mass concentration CUAHSI -2 0 0 Has same dimensionality as mass per unit area Chemistry 0 0 1 A mass concentration per unit length. These units can be used to measure concentration inputs of a chemical along the length of a waterway. 0 0 U1 0 Hazen units (HU) 0 Color Do not use conversions within this unit group! 0 0 1 CUAHSI Dimensionless Units used to describe hue and coloration. 1 Yank 0 0 Yank is the rate of change of force. -3 Newtons per second (N/s) L1M1T-3 Aquarius 0 Mechanics 0 1 0 0 Power Mechanics Watt (W) http://qudt.org/vocab/quantity#Power QUDT L2M1T-3 0 1 Power is the rate at which work is performed or energy is transmitted, or the amount of energy required or expended for a given unit of time. As a rate of change of work done or the energy of a subsystem, power is: P = W/t where P is power W is work t is time. Heat flow rate follows identical units to Power 2 -3 0 Mechanics 1 -3 Aquarius 0 In physics, jerk, also known as jolt, surge, or lurch, is the rate of change of acceleration; that is, the derivative of acceleration with respect to time, and as such the second derivative of velocity, or the third derivative of position. [Wikipedia: https://en.wikipedia.org/wiki/Jerk_%28physics%29] 0 0 L1T-3 Meters per second cubed (m/s^3) 0 Jerk 0 Medical term - many specific arbitrary units based on different substances. Do not use conversions within this unit group! 0 0 0 Units used mainly in chemical and biochemical laboratories. 0 -1 0 Biological activity Chemistry http://dbpedia.org/page/Biological_activity 0 T-1 Wikipedia T2 QUDT 0 Second time squared (s^2) Time squared 0 Space and Time 0 0 http://qudt.org/vocab/quantity#Timesquared 2 0 0 Temperature per magnetic flux density M-1T2I1?1 0 http://qudt.org/vocab/quantity#TemperaturePerMagneticFluxDensity -1 0 1 QUDT Thermodynamics Kelvin per Tesla 2 1 0 http://qudt.org/vocab/quantity#Magneticdipolemoment 1 QUDT 0 The magnetic moment of a system is a measure of the magnitude and the direction of its magnetism. Magnetic moment usually refers to its Magnetic Dipole Moment, and quantifies the contribution of the system's internal magnetism to the external dipolar magnetic field produced by the system (that is, the component of the external magnetic field that is inversely proportional to the cube of the distance to the observer). The Magnetic Dipole Moment is a vector-valued quantity. 0 0 0 L2I1 2 Joule per Tesla (J/T) Magnetic dipole moment 0 Electricity and Magnetism 0 0 0 0 0 W*m-2 0 0 See https://en.wikipedia.org/wiki/Energy_flux Energy flux is the rate of transfer of energy through a surface. The quantity is defined in two different ways, depending on the context. In the first context, it is the rate of energy transfer per unit area (SI units: W·m?2 = J·m?2·s?1). This is a vector quantity, its components being determined in terms of the normal (perpendicular) direction to the surface of measurement. This is sometimes called energy flux density, to distinguish it from the second definition. Radiative flux, heat flux, and sound energy flux are specific cases of energy flux density. In the second context, it is the total rate of energy transfer (SI units: W = J·s?1). This is sometimes informally called energy current. Energy flux Inverse count 0 Chemistry 0 QUDT http://qudt.org/vocab/quantity#Inversecount 0 0 N-1 0 0 -1 Per mole (mol^(-1)) M1T-3?-1 0 0 Heat transfer Coefficient Watt per square meter kelvin (W/(m^2-K)) 1 0 0 -1 Thermodynamics -3 http://qudt.org/vocab/quantity#CoefficientOfHeatTransfer The heat transfer coefficient or film coefficient, in thermodynamics and in mechanics is the proportionality coefficient between the heat flux and the thermodynamic driving force for the flow of heat (i.e., the temperature difference, ?T) QUDT Any unit or combination of units that has no dimensions. A Dimensionless Unit is a quantity for which all the exponents of the factors corresponding to the base quantities in its quantity dimension are zero. U1 1 Dimensionless 0 0 0 http://qudt.org/schema/qudt#DimensionlessUnit 0 unitless QUDT 0 Dimensionless 0 1 http://qudt.org/vocab/quantity#ElectricCurrent An electric current is a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in a plasma. The SI unit for measuring an electric current is the ampere, which is the flow of electric charge across a surface at the rate of one coulomb per second. [Wikipedia: https://en.wikipedia.org/wiki/Electric_current] 0 0 QUDT Electrical current ampere (A) = Coulombs per second 0 0 0 Base Quantity 0 I1 1 0 Chemistry QUDT Mass per electrical charge 1 Tesla Second (T s) 0 0 M1T-1I-1 http://qudt.org/vocab/quantity#MassPerElectricCharge -1 0 Square meter per kelvin (m^2/K) 2 Area thermal expansion 0 QUDT 0 L2?-1 Thermodynamics When the temperature of a substance changes, the energy that is stored in the intermolecular bonds between atoms changes. When the stored energy increases, so does the length of the molecular bonds. As a result, solids typically expand in response to heating and contract on cooling; this dimensional response to temperature change is expressed by its coefficient of thermal expansion. Different coefficients of thermal expansion can be defined for a substance depending on whether the expansion is measured by: * linear thermal expansion * area thermal expansion * volumetric thermal expansion These characteristics are closely related. The volumetric thermal expansion coefficient can be defined for both liquids and solids. The linear thermal expansion can only be defined for solids, and is common in engineering applications. Some substances expand when cooled, such as freezing water, so they have negative thermal expansion coefficients. [Wikipedia: https://en.wikipedia.org/wiki/Thermal_expansion] -1 0 0 0 http://qudt.org/vocab/quantity#AreaThermalExpansion