Why is pressure constant in a solution diffusion model?
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Fick's Law. Fick's law is then combined with the continuity equation similar to (3.51)(3.54)divf+∂n∂t=0,expressing that changes in concentration are equal to minus the sum of fluxes out of the parcel volume in all directions.
Fick's 2nd law of diffusion
Consider diffusion at the front and rear surfaces of an incremental planar volume. Fick's 2nd law of diffusion describes the rate of accumulation (or depletion) of concentration within the volume as proportional to the local curvature of the concentration gradient.
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