The enthalpy of fusion is the amount of heat energy required to change a substance from a solid to a liquid at constant pressure, without changing its temperature. This phase transition occurs at the melting point, where the solid absorbs heat energy to break the bonds holding its molecules in a rigid structure, allowing them to move freely in the liquid state. The enthalpy of fusion is a key concept in understanding latent heat and the thermodynamic behavior of materials during phase transitions.
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