4.1. Absolute Humidity

The Absolute Humidity is the weight of actual amount of water vapour present in a unit volume of air. Generally it is expressed as grams per cubic meter of air. The absolute humidity varies from place-to-place and from time-to-time. It decreases from the equator towards the poles. . Generally, the absolute humidity changes as air temperature or pressure changes. However, if temperature increases but there is no excess water for evaporation then absolute humidity will not change.