Diffusivity (biology)

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This is the diffusion coefficient in Fick's law. It is a proportionality constant between the mass flux due to diffusion and the gradient in the concentration of the species.

It is generally prescribed for a given pair of species. For a multi-component system, it is prescribed for each pair of species in the system.

The higher the diffusivity (of one substance with respect to another), the faster they diffuse into each other.

This coefficient has the units of (length²/time).