Diffusion equilibrium

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Diffusion equilibrium is reached when the concentrations of the diffusing substance in the two compartments becomes equal.

Consider two systems; S₁ and S₂ at the same temperature and capable of exchanging particles. If there is a change in the potential energy of a system; for example μ₁>μ₂ (μ is Chemical potential) an energy flow will occur from S₁ to S₂, because nature always prefers low energy and maximum entropy.
Though the different systems are at equilibrum, there is still water passing through the [[semipermeable]] membrane. So if you put food coloring in system A, eventually it would be of equal color to system B.,

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