Why change of state takes place?
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Change of state takes place when heat is absorbed or released by a substance.
When a substance absorbs heat, it changes from solid to liquid or from liquid to gas, as the heat is used to free or losen the molecules in the solid or the liquid respectively.
When heat is released by a substance, that is when the substance is cooled, it changes from liquid to solid or gaseous to liquid, as absence of heat results in contraction of the molecules.
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