Evaporation causes cooling | Heat | Physics

Evaporation is a naturally occurring process. Molecules on the surface of a liquid are randomly breaking free all the time, and some liquids do this more than others. Evaporation is an endothermic process, it uses surrounding heat and so has a cooling effect. Any surface that has an evaporating liquid on it is cooler than its surroundings. In an air conditioner gases are liquefied so they'll evaporate very fast at room temperature, making the place become cooler.

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