Fick's law deals with

Ans.A. Passive diffusion of molecules along the concentration gradient.Fick's law of diffusion: The magnitude of the diffusing tendency is directly propoional to the cross-sectional area across which diffusion is taking place and the concentration gradient or chemical gradient, which is the difference in the concentration of the diffusing substance divided by the thickness of the membrane. The time required for equilibrium by diffusion is propoional to the square of diffusion distance.Diffusion is the process by which a gas or substance in solution expands, because of the motion of its paicles, to fill all of the available volumes.