Explain relative humidity.

1.	Explain relative humidity.
Answer» The amount of water vapour present in the atmosphere is called humidity. Relative humidity is the ratio between the maximum water vapour that the air can hold at a given temperature and pressure and the actual amount of water vapour it holds at any given time. For example, at 20°C temperature air can contain 80 gms of water vapour per cubic meter. If the actual water vapour present is 40 gms, the relative humidity is 50%. If the atmosphere has 100% relative humidity, it is known as saturation level. Relative humidity decreases with increase of temperature and decrease of water vapour, In high humidity, our sweat doesn’t cool us because it cannot evaporate. In low humidity we feel more thirsty.

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