Humid air is less dense or "thinner" than dry air, because humid air has H²O in it which weighs less than the molecules it's displacing like N² and O² as nitrogen doubles up with itself and has an atomic weight of 14 meaning 2 nitrogens is 28 and oxygen has an atomic weight of 16 so 2 oxygen molecules is 32. Hydrogen has an atomic weight of 1 so 2 hydrogen molecules is 2 and 1 oxygen molecule is 16 as previously stated for a total of 18. Water molecules weigh much less than oxygen molecules whic...
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