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if you are familiar with the cartilage free swelling problem, you must have seen the boundray condition on cartilage-solution boundary where Mu=Mu*. Does this mean or imply that concentrations (or densities) of the components as well as the pressure on the boundary are the same as of those in the solution, i.e. does it mean that apparent density of water and ions are equal to the free solution and therefore are constant on the boundary. because that means the boundary is in equilibrium with solution and therefore the strain value on the boundary is set to zero.