Which contains more heat, 1 kg of water at 100° C or 1 kg of steam at 100° C? Give reason for your answer.

The latent heat of vaporization of water is 22.5 × 105 J/kg. It means that 22.5 × 105 J of heat is required to change 1 kg of water at 100°C into steam at the same temperature.

This means that when the temperature of the water is raised, it starts getting converted into steam, as soon as the latent heat of vaporization is achieved. Since water gets converted into steam on gaining heat, steam has more heat than water at the same temperature, in this case, 100°C. Steam gets converted into the water on losing this heat.