Question

why is the density of moist air less than that of dry air ?
well then the mass of air should increase right..??if we are adding water molecules​

Answer 1

Answer:

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WHY IS MOIST AIR LESS DENSE THAN DRY AIR AT SAME TEMPERATURE. The units of density are mass divided by volume (m/V). ... Thus, when water vapor increases, the amount of Oxygen and Nitrogen decrease per unit volume and thus density decreases because mass is decreasing.

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Answer 2

Answer:

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.