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heat of fusion

noun

, Physics.
  1. the heat absorbed by a unit mass of a given solid at its melting point that completely converts the solid to a liquid at the same temperature: equal to the heat of solidification.


heat of fusion

  1. The amount of heat required to convert a solid at its melting point into a liquid without an increase in temperature. Liquids release the same amount of heat when they solidify.


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heat of formationheat of reaction