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. Encompases both kinematic viscosity and thermal diffusivity 0 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. 0 0 -1 L2T-1 new for ODM2 0 Diffusivity Fluid Mechanics 0 Square meter per second (m^2/sec) 2