Question

out of wet and dry air which one is heavier and why?

Answer 1

Wet air is heavier than of the dry air because it contains water vapour

Answer 2

“Dry” air contains no water vapor, and is mostly a mixture of molecular nitrogen (N2) and molecular oxygen (O2). ... Since mole per mole, dry air is heavier than water vapor, any mixture of dry air with water vapor will weigh less than pure dry air. The more water vapor in the air, the smaller its molecular weight will be