Diffusivity is a rate of diffusion, a measure of the rate at which particles or heat or fluids can spread.
It is measured differently for different mediums.
Diffusivity may refer to: Thermal diffusivity, diffusivity of heat Diffusivity of mass: Mass diffusivity, molecular diffusivity (often called "diffusion coefficient") Eddy diffusion, eddy diffusivity Kinematic viscosity, characterising momentum diffusivity Magnetic diffusivity
Dimensions and units
Diffusivity has dimensions of length2 / time, or m2/s in SI units and cm2/s in CGS units.
See also Diffusibility
References