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The kinetic theory of matter states that all molecules are made up of a large number of tiny atoms or molecules, which are in continuous motion. So the molecules in the liquid are in continuous motion. This motion is measured as kinetic energy, or temperature. So temperature is the measure of average kinetic energy. Note the "average". Some of the molecules move faster, some move slower. Those that are faster eventually break free of their bonds to become gasses. If temperature is increased, then the molecules move about faster, and therefore more of them break free of their bonds.

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