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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.
Select the correct statement from the following: A beaker of hot water will evaporate faster than a similar beaker of cold water. The particles of a liquid with the most energy are least likely to evaporate from the liquid. Evaporation of a liquid from a surface e.g. sweating, will cause an increase in temperature.