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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.
When the skin excretes water (sweats) through the sweat glands, the evaporation of the water can help cool the skin as it absorbs heat from the body to change from liquid to v â¦ apor. The Heat of Vaporization of water at, hmmm, let's say 104 Â°F (40 Â°C) is 43.350 kJ/mol or 2408 J/g.O, Sweat evaporates off the skin helping to cool you down, wiping it off will make you hotter.