Topic: humidity, relative humidity.

Humidity Humidity generally describes the quantity of water vapour available in the air. Dry air has a very low quantity of water vapour while wet or humid air has high quantity of water vapour. When human body sweats in a dry air, the sweat evaporates faster than when the air is damp and contain plenty of water vapour.  Humid air is a wet air while non humid air is a dry air. ...