Air Circulation Question

Originally Posted by T.G

Nope. Humid air is actually lighter than dry air.

I thought that, but it didn't sound right to me.

Edit to add: I looked it up, you are correct.

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The amount of water vapor in the air also effects the density. Water vapor is a relatively light gas when compared to diatomic Oxygen and diatomic Nitrogen. Thus, when water vapor increases, the amount of Oxygen and Nitrogen decrease per unit volume and thus density decreases because mass is decreasing.