Power per area quartic temperature 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] Thermodynamics QUDT http://qudt.org/vocab/quantity#PowerPerAreaQuarticTemperature ODM2 Units Type Controlled Vocabulary ODM2 Working Group A vocabulary for describing the type of the Unit or the more general quantity that the Unit represents.