Question

Define latent heat of fusion and vaporisation .state their units

Answer 1

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Latent Heat of fusion:
The amount of heat energy released or absorbed when a solid changing to liquid at atmospheric pressure at its melting point is known as the latent heat of fusion.
latent heat of fusion is the amount of heat energy required to change 1Kg of solid to liquid.

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.

Latent heat of vaporization:
The amount heat required to convert unit mass of liquid into its vapour state without change in its temperature called is latent heat of vaporization.

Unit:SI unit joule per kilogram [J/kg].

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Answer 2

Amount of energy required to change 1 kg of solid to liquid is known as latent heat of fusion.
Amount of energy required to change 1kg of liquid into solid is known as latent heat of vaporisation