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On Sat, 22 Mar 1997, Fred Bucheit wrote:
When water evaporates from a water droplet it does not add mass to the
atmosphere, it displaces air thereby making the air lighter. Diatomic
nitrogen has an atomic mass of 28 and diatomic oxygen has an atomic mass of
32 but a water molecule has a mass of 18.
Humid air is less dense than dry air and therefore tends to rise in the
atmosphere.
Ah, that helps. I didn't know how to visualize evaporated water as
compared to nitrogen. So, in simple language, water vapor acts more like
He than like CO2.
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