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For more on marking an answer as the "Best Answer", please visit our FAQ.Dacetine (and any others), It is all to do with Avogadro.
If the temperature and pressure remain constant, a fixed volume of air will contain the same number of molecules, regardless of the gas. At Standard Temperature and Pressure (STP) 22.4 litres of gas will contain 2g of Hydrogen, or 28g of Nitrogen, or 32g of Oxygen, or 18g of water vapour. Air being mostly nitrogen + oxygen will weigh around 29g per 22.4 litres. As water vapor enters the air, it does not add to the mass, it displaces some of the heavier N2 and O2 molecules and replaces them with the lighter water molecules (H2O). The density of air therefore goes down as the air gets more humid.
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