Fick laws of diffusion
- the direction of movement of solutes by diffusion is always from a higher to a lower concentration, and the diffusive flux JA of solute A across a plane at x is proportional to the concentration gradient of A at x; JA = -D(?CA/?x);
- the increase of concentration of solute A with time, ?CA/?t, is directly proportional to the change in the concentration gradient, ?CA/?t = D(?2/?x2).
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