define heat of fusion .
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The enthalpy of fusion of a substance, also known as heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.
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Heat of fusion' measures the amount of energy needed to melt a given mass of a solid at its melting point temperature. Conversely, it also represent the amount of energy given up when a given mass of liquid solidifies. Water, for example, has a heat of fusion of 80 calories per gram.
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