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That is, water has a high heat of vaporization, the amount of energy needed to change one gram of a liquid substance to a gas at constant temperature. Waterâs heat of vaporization is around 540 cal/g at 100 Â°C, water's boiling point. Note that some molecules of water â ones that happen to have high kinetic energy â will escape from the surface of the water even at lower temperatures.
Why does water evaporate at room temperature? up vote 8 down vote favorite. 1. When water temperature reaches $100\ ^\circ \mathrm{C}$, the molecules get so excited that the hydrogen atoms lose the bonds to the oxygen atom and therefore the water starts to become gas.