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What is Humidity?
Humidity is the concentration of water vapour present in the air. The more water evaporates in a given area, the more water vapour rises into the air, and the higher the humidity of that area is. Hot places tend to be more humid than cool places because heat causes water to evaporate faster.
Three primary measurements of humidity are widely used, and they are:
1. Absolute humidity It is the total mass of water vapor present in a given volume or mass of air. It does not take temperature into consideration and describes the water content of the air and is expressed in either gram per cubic meter or grams per kilogram.
2. Relative humidity It is expressed as a percentage, indicating a present state of absolute humidity relative to a maximum humidity given the same temperature.
3. Specific humidity is the ratio of water vapour mass to total moist air parcel mass.
A device that is used to measure humidity is called a psychrometer or hygrometer.
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