Answer:
Dry air mainly contains gases like
nitrogen and oxygen along with small proportions of the other gases. The wet
air on the other hand, also contains a small amount of water vapours. Now,
vapour density of water vapours is less than that of nitrogen and oxygen
because molar mass of \[{{H}_{2}}O\] (18) is less than that of \[{{N}_{2}}\](28)
and \[{{O}_{2}}\] (32). This means that heavier molecules of nitrogen and
oxygen have been replaced by lighter molecules of water vapours when the dry
air changes to wet air. Therefore, dry air is heavier than wet air.
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