Humidity is the amount of moisture (water vapour) in the air.
A hygrometer has two thermometers, a dry one and a wet.
Humidity is measured by using a table that looks at the difference between the wet bulb and the dry bulb.
A hygrometer can also be used to find dew point.
There is a difference between the dry and wet bulb thermometers because of latent heat created during the process of evaporation.
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