The process of evaporation adds water to the atmosphere. This changes the water from the liquid form to the gaseous form. Water vapour which is present in the atmosphere is known as humidity.
- Absolute humidity is the content of water vapour present in the given volume of air. It is expressed in terms of grams per cubic metre (grams of water vapour present per cubic metre of air).
- Relative humidity is the ratio between the actual amount of water vapour present in the air and the maximum amount of water the air can hold at that temperature. It is expressed in percentage.
- It can be measured by applying the following formula:
- Relative Humidity = the actual amount of water vapour present in the air/the maximum amount of water vapour the air can hold at that temperature × 100
- Dew point is the temperature at which air gets fully saturated.
- Specific humidity is the actual amount of water vapour present in a given mass of air.
- Humidity is measured by a hygrometer which is also known as the Dry and Wet Bulb Thermometer.
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