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Water is made up of many molecules that are in constant, random motion. These molecules collide with each other to gain or lose kinetic energy from or to other molecules. The molecules nearer to the surface of the water and have high enough kinetic energy will be able to change from liquid to gaseous state. Since the molecules with higher kinetic energy have moved out of the water, the average kinetic energy of the water drops which inturns means that the temperature of water will drop as well.

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