What is meant by saying that the latent heat of vaporisaiotn of water is 22.5 x 105 J/kg
Latent heat of vaporization of water means that 2,260 kJ of heat must be provided to convert 1 kg of water at 100ºC into 1 kg of vapour at 100ºC. Conversely, 2260 kJ of heat is released when 1 kg of vapour condenses at 100ºC to give 1 kg of water at 100ºC.