How does evaporation cause cooling of a container having a liquid?
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Molecules in a liquid have varying speeds. Some have low speeds and some have high speed. For molecules of a liquid to evaporate, they must be located near the surface, be moving in the proper direction, and have sufficient kinetic energy to overcome liquid-phase intermolecular forces.[1] When only a small proportion of the molecules meet these criteria, the rate of evaporation is low. Since the kinetic energy of a molecule is proportional to its temperature, evaporation proceeds more quickly at higher temperatures. As the faster-moving molecules escape, the remaining molecules have lower average kinetic energy, and the temperature of the liquid decreases. This phenomenon is also called evaporative cooling.
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Answer:This causes the molecules that remain to be cooler on average. During evaporation of a liquid the molecules of liquid having high kinetic energy move out off the surface of the liquid leaving behind the molecules with low kinetic energy.
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