Today I Learned (TIL)

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TIL less humid air increases atmospheric pressure. Air is mostly nitrogen (78%) and oxygen (21%). Water vapor is less dense than air because hydrogen is lighter, so it displaces heavier gases, red... (weatherweasel.com)

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The original was posted on /r/todayilearned by /u/jacknunn on 2025-04-25 14:39:24+00:00.

Original Title: TIL less humid air increases atmospheric pressure. Air is mostly nitrogen (78%) and oxygen (21%). Water vapor is less dense than air because hydrogen is lighter, so it displaces heavier gases, reducing air density and lowering pressure when humidity is high

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