Boiling point of water is 100 degree c,at 1 atmospheric pressure,please explain humidity in normal pressure .

Question

Boiling point of water is 100 degree Celsius,at 1 atmospheric pressure,please explain water vapor present in normal ambiance which is at normal pressure (1 atmospheric pressure) and at a temperature well below 100 degree Celsius

Answer 1

what do you want explained? just because the temperature is below boiling, doesn't mean water can't evaporate. And evaporation is what causes humidity. Water molecules evaporate off the surface of any liquid water into the air until there are enough of them to form an equilibrium (100 percent humidity).

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Answer 2

Above every liquid, there is a certain amount of vapor of the same liquid which has a given pressure. This is called partial pressure. At 37C, partial pressure of water is 47 torrs. It is only when the partial pressure equals the atmospheric pressure that the liquid evaporates