Question

Relative humidity define it

Answer 1

It is the amount of ratio in the air to amount of moisture that air can hold.

Answer 2

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

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.