All other variables equal, humid air is less dense than drier air because:
A) water molecules are negatively charged and thus repel other molecules.
B) the molecular weight of water is less than that of either diatomic oxygen or diatomic nitrogen.
C) some of the water in humid air will condense, and the latent heat released will expand the air.
D) water molecules have a lower average velocity than does diatomic nitrogen.
Answer: B
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