Question

Define
(1) Latent Heat
(2)latent Heat of fusion
(3) Latent heat of vaporisation​

Answer 1

The latent heat of a phase is the quantity of heat energy absorbed by the unit mass of the substance for the change in its phase for a constant temperature

The specific latent heat of fusion of ice is the heat energy required to melt unit mass of ice at 0 degree Celsius to water at 0 degree Celsius without change in temperature

Answer 2

1. Latent heat (also known as latent energy, or as Heat of Transformation) is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process — usually a first-order phase transition.

2. The 'enthalpy' of fusion is a latent heat, because during melting the heat energy needed to change the substance from solid to liquid at atmospheric pressure is latent heat of fusion, as the temperature remains constant during the process.

3. Latent heat of vaporization is a physical property of a substance. It is         defined as the heat required to change one mole of liquid at its boiling point under standard atmospheric pressure. It is expressed as kg/mol or kJ/kg.

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