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Q: Diffusion and Chemical Reaction

Na'omiI am reading the book The Mathematics of Diffusion by J. Crank (cf. Crank_1975_Diffusion) and, at page 326, I could not understand the meaning of: "In the simplest case, the concentration $S$ of immobilized substance is directly proportional to the concentration $C $ of substance free to diffuse...

 

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