{{SIA-Conversion-Expand}} '''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 length<sup>2</sup> / time, or m<sup>2</sup>/s in SI units and cm<sup>2</sup>/s in CGS units.
== See also == * Diffusibility
==References== {{reflist}}
Category:Former disambiguation pages converted to set index articles<!--- admin note: pls keep even if page becomes disambiguation again--->
{{SIA}}