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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.
Adding heat to melt ice does not result in a temperature change. Melting 1 gram of ice requires 80 calories. Latent heat of melting Freezing 1 gram of water releases 80 calories. Latent heat of fusion Latent heat is also during evaporation, the process of converting a liquid to a gas. The latent heat of vaporization is the energy absorbed by water during evaporation.