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