GENERAL KNOWLEDGE

Detailed explanation-1: -Water existing as a gas is called water vapor. When referring to the amount of moisture in the air, we are actually referring to the amount of water vapor. If the air is described as “moist", that means the air contains large amounts of water vapor.

Detailed explanation-2: -Water vapour is called so because it is water in gas phase. Vapour is a substance which is in gas phase but at a temperature lower than its critical temperature, so that it can be converted to liquid phase or solid phase by increasing pressure and keeping temperature constant.