Question

Dry air is heavier than wet air. Why? ​

Answer 1

Dry air is heavier than wet air because water molecules which replace nitrogen and oxygen in dry air weighs 18g which is much less weight of nitrogen (28g per molecule) and oxygen (32g per molecule) replaced.

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Answer 2

Dry air consists mostly of nitrogen and oxygen molecules which way more than water molecules this means that when given volume of air is made more moist by adding water molecules heavier molecules are replaced with lighter molecules.