Question

Define relative humidity.

Answer 1

Relative humidity is the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature. Relative humidity depends on temperature and the pressure of the system of interest. The same amount of water vapor results in higher relative humidity in cool air than warm air.

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Answer 2

$\LARGE\green{ \underline{\underline{\sf{Relative\: humidity}}}}$

The ratio between the amount of water vapour present in the atmosphere and the total water holding capacity of the atmosphere at a given temperature is called relative humidity .

It is usually expressed in percentage .

For example , if the absolute humidity is half of the total water holding capacity at a particular temperature , then the relative humidity will be 50%.

Relative humidity is measured using an instrument called wet and dry bulb thermometer.