Thursday, March 19, 2026

Cold, humid air is lighter than cold, dry air

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By Michael Czarick

& Dr. Brian Fairchild

Special to Poultry Times

ATHENS, Ga. — Probably the vast majority of people on the street if you asked them would say that humid air is heavier than dry air. After all, humid air has more moisture in it and therefore should weigh more than air that contains less moisture. But, in actuality dry air weighs more than humid air.

This is because moist air contains more water molecules which tend to displace oxygen and nitrogen molecules (actual oxygen levels in air are not significantly affected by humidity). Since a. . .

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