Question

Why does moist air exert less pressure?
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Answer 1

Answer:

A water molecule (H2O) has a molecular weight of 18 (1 + 1 + 16). ... This means that when a given volume of air is made more moist by adding water molecules, heavier molecules are replaced with lighter molecules. Therefore, moist air exert less pressure than dry air if both are at the same temperature and pressure.

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