Relative Humidity <!-- google_ad_client = "ca-pub-0916533245744110"; /* Title links */ google_ad_slot = "9325124257"; google_ad_width = 468; google_ad_height = 15; //-->

Humidity is the amount of water vapour in the air. In daily language the term "humidity" is normally taken to mean relative humidity. Relative humidity is defined as the ratio of the partial pressure of water vapour in a parcel of air to the saturated vapour pressure of water vapour at a prescribed temperature.