Question

what is meant by latent heat of vapourisation ?

Answer 1

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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. When a material in liquid state is given energy, it changes its phase from liquid to vapor; the energy absorbed in this process is called heat of vaporization.

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Answer 2

When the substance which in liquid state is given energy, it changes state to the vapour (gaseous).

Hence, this is a physical property of the substance. This is called 'Latent heat of vaporization'.

Latent of vaporization is the form of latent heat which turns behind boiling.