How do you derive it? I'm looking for the form J = -D(dC/dX)(adsbygoogle = window.adsbygoogle || []).push({});

From the image, I am assuming left side is of higher concentration. N represents the number of molecules.

My work:

Mass balance

Net molecules in from concentration gradient =

Net = N(x) - N(x+Delta X)

Net concentration in = molecule/volume

= [N(x) - N(x+delta x)] / (A * Delta X)

= dC

And then I'm stuck! I probably went about this totally wrong.

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# Fick's First Law Derivation

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