<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Latent heat is thermal energy released or absorbed, by a body or a thermodynamic system, during a constant - temperature process--usually a first - order phase transition . </P> <P> Latent heat can be understood as heat energy in hidden form which is supplied or extracted to change the state of a substance without changing its temperature . Examples are latent heat of fusion and latent heat of vaporization involved in phase changes, i.e. a substance condensing or vaporizing at a specified temperature and pressure . </P> <P> The term was introduced around 1762 by British chemist Joseph Black . It is derived from the Latin latere (to lie hidden). Black used the term in the context of calorimetry where a heat transfer caused a volume change in a body while its temperature was constant . </P>

What is the definition of latent heat of fusion
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