Why are melting point and freezing point the same temperature for any substance?

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lynn30k | High School Teacher | (Level 1) Educator

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The two terms mean the same thing--the temperature at which the state of a substance changes from a solid to a liquid, or vice versa. When it goes from solid to liquid, we refer to "melting point"; when the change is from liquid to solid, it is the "freezing point", but the temperature of the change is the same.