Question

define humidity????​

Answer 1

a quantity representing the amount of water vapour in the atmosphere or in a gas."Humidity" refers to the presence of water vapor in the atmosphere. It is measured in either relative terms (relative humidity) or absolute terms (dewpoint temperature).  

Water vapor is, as the name implies, the vapor form of water. It is totally transparent, just like the rest of the gases in the atmosphere. So, we really can't see humidity with our eyes...only the effects of water vapor condensing back into water droplets

Relative humidity is a measure of how close to saturation the air is with water vapor. At any given temperature and pressure, air can "hold" only so much water vapor before the vapor begins to form liquid water drops, such as fog or clouds. At 100% relative humidity, the air is saturated. A relative humidity of 0% would indicate that no water vapor is present.  

Dewpoint temperature is an absolute measure of how much water vapor is in the air. The warmer the air, the greater the amount of water vapor it can contain. So, for example, if air at a temperature of 100 deg. F had a dewpoint of 80 deg. F, this would be a very large amount of water vapor in absolute terms, but the relative humidity would only be about 53%, indicating the air could hold almost 2 times more vapor before becoming saturated.  

At a very cold temperature of, say, 0 deg. F, if the dewpoint is also 0 deg. F, then the relative humidity is 100% (the air cannot hold any more vapor without liquid droplets or ice crystals forming), but the absolute humidity is very low, that is, there is very little water vapor in the air in absolute terms.

Answer 2

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The water content in the atmosphere is called humidity .

The actual amount of water present in the atmosphere is called absolute humidity . It is measured as the amount of water vapour present per cubic metre volume of air (g/m³) .

Factors influencing the amount of moisture present in the air :

✓Temperature

✓Time

✓Water bodies

There is a limit to the amount of water vapour the atmosphere can hold at a certain temperature . The stage at which the atmosphere is fully saturated with water is termed as saturation level .