the density of moist or humid air is less than the density of dry air why

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Solution

density=Mass/Volume
The molecular weights of O₂ , N₂ and H₂O are 32, 28, and 18 atomic mass units.for a certain volume in moist air H₂O molecule will be substitute for a O₂ or N₂molecule.which will decrease the total mass of air for that volume of air. Since the volume is same for both moist air and dry air. the density of water-containing air must be less than the density of dry air

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