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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.
Water as a Gas-Look at this picture of gas. Water can evaporate or disappear with the help of heat. Changes in temperature can increase the rate or how long it takes water to evaporate. Evaporate means to disappear. Water can evaporate from soil. It evaporates off wet clothes hanging on a clothesline. Plants release water vapor into the air.