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Chemistry · L3 · Gas Expanding to Fill a Container — Entropy Increase

A gas confined to one corner of a container spreads out to fill the whole space on its own — particles spreading out is an increase in entropy, and the reverse never happens spontaneously.

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Gas confined to one cornerof an empty containerValve or barrieris removedParticles spread outto fill the whole containerEntropy has increased:many more ways to arrangespread-out particlesGas spontaneously re-crowdinginto one cornernever happens on its own

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