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Heat of fusion is the heat absorbed by a unit mass of a solid chemical element at its melting point in order to convert the solid into a liquid at the same temperature. The heat of fusion is equal to the heat of solidification.
The energy that goes into melting a solid is used to dissociate the intermolecular bonds holding its molecules in place rather than to increasing the average thermal velocity of the molecules.
Often a point of confusion, Heat of fusion is essentially the "heat of melting" of a substance.
Chemical properties
