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The amount of heat energy that is required to change 1kg of solid into liquid at atmospheric pressure as its melting point is known as latent heat of fusion.
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The energy required in calories to completely convert one gram of water to steam without increasing the temperature is called the latent heat of vaporization. It is called latent heat because it does not increase the temperature.

Latent heat of fusion of ice is heat energy required in calories by one gram of ice to completely convert itself into water without increase in temperature.
Latent heat of fusion of a substance is the amount of heat required to convert unit mass of the solid into the liquid without a change in temperature.
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