- #1

member 392791

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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- Thread starter member 392791
- Start date

- #1

member 392791

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?

- #2

nasu

Gold Member

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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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