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 what is latent heat of fusion and vaporisation ??

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.

Latent heat of Vaporization : It is the heat required to change 1 kg of a liquid substance into gaseous state at atmospheric pressure, at the boiling point of the substance. For example, amount of heat required to vaporize water at 100 ° C into the vapor state at 100 ° C, atmospheric pressure, will be known as the Latent Heat of Vaporization of water.

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the latent heat of vaporization is the amount of Heat Energy that is required to raise one gram of water from the liquid state to the gaseous state. 
The latent heat of vaporization is the energy required to convert liquid to gas. It is expressed in joules per gram and varies from substance to substance. The energy is required to enable the molecules of liquid to overcome the molecular attraction between molecules and break free to become free-moving molecules of gas.


The amount of heat required to convert a unit mass of a solid at its melting point into a liquid without an increase in temperature.



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When something changes phase from solid to liquid it takes energy to break the intermolecular interactions. The heat supplied is used for overcoming these particle attraction forces. The solid absorbs heat energy without any change in temperature. The amount of heat consumed in the conversion of a unit mass of a solid into its liquid state without undergoing a change in temperature is called the latent heat of fusion.
 
 
The latent heat of vapourisation is the amount of heat required when a given quantity of liquid is vapourised.
For e.g. the latent heat of vapourisation of water is 2260 kJ/Kg(at 100 degree C).
 
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Latent Heat of Fusion - The heat energy which is required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point is called latent heat of fusion.

Latent Heat of Vapourization - The heat energy which is required to change 1 kg of a liquid into gas at atmospheric pressure at its boiling point is called latent heat of vapurization.

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Latent Heat of Fusion - The heat energy which is required to convert some amount of solid into liquid is known as the latent heat of fusion.

Latent Heat of Vapuorisation - The heat energy which is required to convert some amount of liquid to the gaseous state is known as the latent heat of vapuorisation.

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