Chemistry / Chem 2074 · Atom · ~20 seconds
Entropy Rises with Accessible Microstates
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Microstate count predicts a spontaneous entropy change's direction: the most probable outcome has the most microstates.
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Four gas particles in two flasks split two-and-two far more often than crowding into one, since more microstates match the even split.
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An even split is only the most probable outcome, not a guarantee — with few particles, uneven splits still occur.