Latent heat of fusion is the amount of energy required to change a substance from a solid to a liquid at its melting point. For example, the latent heat of fusion of ice is 334 kJ/kg, which means that it takes 334 kJ of energy to melt 1 kg of ice at 0°C.
Latent heat of vaporization is the amount of energy required to change a substance from a liquid to a gas at its boiling point. For example, the latent heat of vaporization of water is 2260 kJ/kg, which means that it takes 2260 kJ of energy to vaporize 1 kg of water at 100°C.
The latent heat of fusion and vaporization are important properties of substances because they determine how much energy is required to change their phase. This information is useful for a variety of applications, such as designing heating and cooling systems, and manufacturing processes.
