Question

Explain the ways in which humidity is expressed.

Answer 1

1. Specific humidity is a ratio of the water vapor content of the mixture to the total air content on a mass basis. It is expressed in grams of vapor per kilogram of air.
2. Absolute Humidity is the mass or weight of water vapor present per unit volume of air. It is expressed usually in grams per cubic meter of air.
3. The relative humidity is a ratio between the actual amount of water vapor present in the air and the maximum amount of water vapor it can hold at a given temperature. It is expressed as a percentage.