Question

why moist air is less denser than dry air​

Answer 1

Answer:

Moist air is less denserr then dry air because moist air contain some amount of water vapour in it this is the reason why most air is less denser than dry air.

Answer 2

Answer:

Thus, when water vapor increases, the amount of Oxygen and Nitrogen decrease per unit volume and thus density decreases because mass is decreasing. ... You may be familiar with the concept that moist air is less dense than dry air. This is true when both have the same temperature or when the moist air is warmer.