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Heat of Fusion definition
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The amount of heat required to melt one gram of solid at its melting point with no change in temperature. Usually expressed in J/g. The molar heat of fusion is the amount of heat required to melt one mole of a solid at its melting point with no change in temperature and is usually expressed in kJ/mol.

See also:
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high-efficiency particulate air (HEPA) filter definition
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Heat of Solution definition
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