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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.
â¢Vaporization is an endothermic process. â¢One gram of water gains 2261 joules of energy when it vaporizes. â¢This amount of energy is the heat of vaporization for water. The heat of vaporization varies from substance to substance.