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Fick's second law

by Woopydalan
Tags: fick
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Oct9-13, 10:03 PM
P: 746

I read on wikipedia that the second law represents how concentration changes with time, but I was wondering how taking the partial derivative with respect to x of the first law will give change in concentration with time?
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Oct9-13, 10:59 PM
P: 1,969
See here, for example:'s_laws_of_diffusion

It's not that you get the second law just by taking the derivative of the first law. Conservation of mass is used as well.

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