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Diffusivity
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<p>Diffusivity is a rate of <a href="/facts/Diffusion/KbAxroBa">diffusion</a>, a measure of the rate at which particles or heat or fluids can spread. </p><p>It is measured differently for different mediums. </p><p>Diffusivity may refer to: </p> <ul><li><a href="/facts/Thermal_diffusivity/dRa1aeHY">Thermal diffusivity</a>, diffusivity of heat</li> <li>Diffusivity of mass: <ul><li><a href="/facts/Mass_diffusivity/GSngNem0">Mass diffusivity</a>, molecular diffusivity (often called "diffusion coefficient")</li> <li><a href="/facts/Eddy_diffusion/BJTz4dUv">Eddy diffusion</a>, eddy diffusivity</li></ul></li> <li><a href="/facts/Viscosity/QLVfrdCz">Kinematic viscosity</a>, characterising momentum diffusivity</li> <li><a href="/facts/Magnetic_diffusivity/JxaIscUY">Magnetic diffusivity</a></li></ul>