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Question

Conversion of solid-state to a liquid state is called fusion. What is meant by the latent heat of fusion?


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Solution

Latent heat of fusion

  • Latent means hidden
  • Thus it is a form of hidden form of heat contained in a substance.
  • The amount of heat energy required to change a kg of a solid into liquid at atmospheric pressure at its melting point is known as the latent heat of fusion.
  • It is also known as enthalpy of fusion, which is the amount of energy in the form of heat that must be supplied to a solid substance.
  • When the pressure of the environment is kept constant a change is triggered in the substance that results in a change of physical state i.e to turn into the liquid state.

Thus latent heat of fusion is hidden heat required to convert one kg of solid to liquid state


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