Inversely proportional to the distance over which diffusion must take place, or in other words the thickness of the membrane, D.
Fick's law is also important in radiation transfer equations. However, in this context it becomes inaccurate when the diffusion constant is low and the radiation becomes limited by the speed of light rather than by the resistance of the material the radiation is flowing through. In this situation, one can use a flux limiter.
The exchange rate of a gas across a fluid membrane can be determined by using this law together with Graham's law.
Fick'slaws of diffusion describe diffusion, and define the diffusion coefficient D.
Fick'slaws of diffusion were derived by Adolf Fick in the year 1855.
Equations based on Fick'slaw have been commonly used to model transport processes in foods, biopolymers, pharmaceuticals, porous soils, semiconductor doping process, etc. A large amount of experimental research in polymer science and food science has shown that a more general approach is required to describe transport of components in materials undergoing glass transition.
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