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Chemistry
Diffusion, Migration and Einstein Equation
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[QUOTE="Dario56, post: 6844803, member: 690413"] You are correct that I didn't prove that Einstein equation isn't valid outside the equilibrium. Whether this inference is valid or not isn't really the main point. Main point is that if we want to use Einstein equation outside the equilibrium, we need to prove that it does hold outside the equilibrium. Since Einstein equation is derived from the equilibrium condition, we have no proof that it is valid outside of it and so we shouldn't use it in such conditions. At least I haven't found such a proof. This may come down to the fact that usage of Einstein equation outside of equilibrium gives a good match with the experimental results, makes equations nicer and experiments easier. For example, we only need to measure diffusion coefficient or ionic mobility and can calculate the other one with a reasonable accuracy without needing to measure both. Why this match is in fact good, isn't supported with proofs, but experiments say it's valid. [/QUOTE]
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Diffusion, Migration and Einstein Equation
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