Fick's second law


by Woopydalan
Tags: fick
Woopydalan
Woopydalan is offline
#1
Oct9-13, 10:03 PM
P: 746
Hello,

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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nasu
nasu is offline
#2
Oct9-13, 10:59 PM
P: 1,895
See here, for example:
http://en.wikipedia.org/wiki/Fick'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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