Define latent heat of fusion

Latent heat of fusion is the heat required to change 1 kg of a solid substance into liquid state at the melting point of the substance. For example, amount of heat required to melt ice at 0° C into water at 0° C, will be known as the Latent Heat of Fusion of ice.

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Latent heat of Fusion : It is the heat required to change 1 kg of a solid substance into liquid state at the melting point of the substance. For example, amount of heat required to melt ice at 0 ° C into water at 0 ° C, will be known as the Latent Heat of Fusion of ice.

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 Latent heat of fusion is defined as the heat absorbed when a substance changes it 's phase from liquid to solid state.
 

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 the amount of heat energy required to change 1 kg of solid into liquid at atmospheric pressure is called latent heat of fusion

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Latent heat is the heat released or absorbed by a chemical substance or a thermodynamic system during a change of state that occurs without a change in temperature, meaning a phase transition such as the melting of ice or the boiling of water.

From this definition, the latent heat for a given mass of a substance is calculated by

Q = m L

where:

Q is the amount of energy released or absorbed during the change of phase of the substance (in kJ or inBTU),
m is the mass of the substance (in kg or in lb), and
L is the specific latent heat for a particular substance (kJ-kgm −1 or in BTU-lbm −1), either L f for fusion, or L v for vaporization.
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