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Fick's second law

  1. Oct 9, 2013 #1

    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. jcsd
  3. Oct 9, 2013 #2
    See here, for example:

    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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