Conversation

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

https://weatherweasel.com/barometric-pressure-atmospheric-pressure/
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https://www.reddit.com/r/todayilearned/comments/1k7ml3v/til_less_humid_air_increases_atmospheric_pressure/