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Fick's Law of Diffusion

Describes the flux of a substance across a membrane due to a concentration gradient, governing transport processes in solutions.
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The statement of the theorem

Let JJ be the molar flux (mol⋅m−2⋅s−1\text{mol} \cdot \text{m}^{-2} \cdot \text{s}^{-1}) of a species across a membrane, and let DD be the diffusion coefficient (m2⋅s−1\text{m}^2 \cdot \text{s}^{-1}). The flux JJ is proportional to the negative gradient of the concentration CC with respect to position xx: \nJ=−DdCdxJ = -D \frac{dC}{dx}
Source: Wikipedia