FICK’S LAW FOR DIFFUSION

THE GRAPH SHOWED THAT FLOW, J, IS

PROPORTIONAL TO THE CONCENTRATION

DIFFERENCE, ??C. THE PROPORTIONALITY

CONSTANT, P, IS CALLED THE PERMEABILITY.

J = P ??C

IN WATER, P IS THE DIFFUSION COEFFICIENT, D,

TIMES THE AREA, A, DIVIDED BY THE THICKNESS

OF THE DUFFUSION REGION, ??x: P = DA/ ??x

HENCE WE HAVE FICK’S LAW FOR DIFFUSION:

J = (DA/?x) ??C

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