What is meant by saying latent heat of vaporisation of water is 22.5 × 105 J kg−1 .
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Solution
Latent heat of vaporisation of water is 22.5 × 105 J kg−1 which means that the heat requires to vaporise 1 kg of water is 22.5 × 105 J kg−1.
Latent heat of vaporisation can be defined as the amount of heat needed for the conversion of 1 kg of liquid at its boiling point to gas at the same temperature.