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 diffusion, eddy dispersion, or turbulent diffusion is a process by which substances are mixed in the atmosphere, the ocean or in any fluid system due to eddy motion. In other words, it is mixing that is caused by eddies that can vary in size f ...
, eddy diffusivity
*
Kinematic viscosity, characterising momentum diffusivity
*
Magnetic diffusivity
Dimensions and Units
Diffusivity has dimensions of length
2 / time, or m
2/s in
SI units
The International System of Units, known by the international abbreviation SI in all languages and sometimes Pleonasm#Acronyms and initialisms, pleonastically as the SI system, is the modern form of the metric system and the world's most wid ...
and cm
2/s in
CGS units.
References
Former disambiguation pages converted to set index articles
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