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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.
This is why you probably feel a lot warmer on a hot, humid day than during dry conditions with the same temperature. The high humidity prevents the water from evaporating, and thus, no evaporative cooling can take place. Lesson Summary. In summary, evaporative cooling is the process of removing heat from a surface due to the evaporation of water. Water can absorb a lot of heat without changing phases, allowing it to remove heat from the surface it is on.