Why don't dense gas elements sink to the ground and dense gas elements drift to the sky? Why don't we have layers of oxygen, nitrogen, carbon dioxide, etc.
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2Duplicate question (with answers) on Chemistry SE: Why don't heavy and light gases separate in the atmosphere? – BioPhysicist Feb 11 '20 at 00:17
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1Related question on Physics SE: Why does air remain a mixture? – BioPhysicist Feb 11 '20 at 00:18
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work out $e^{-mgh/kT}$ for various $m$ values. – JEB Feb 11 '20 at 00:36