Evaporation. It has also already known that the molecules of the liquid does not rest with that, but moving all the time, it shows that the molecules of the liquid, each molecule must have speed, or in other words, it is the liquid molecules have kinetic energy. When the molecules are moving will inevitably cause the collisions of molecules that are present in the liquid. What happens is that the molecules of the liquid with a mutual exchange of energy. After a collision of molecules may make one molecule have kinetic energy increases and the other molecules one may have reduced kinetic energy, which in the end will make the individual molecules of the liquid have different kinetic energy, which may be higher or lower than the average kinetic energy. A molecule with high kinetic energy to overcome the attraction between molecules, and finally fall away from the surface of the liquid and becomes a gas. The process is called a molecule of a liquid surface area to fall off the page is a gas that evaporates.
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