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Heat of Fusion and Heat of Vaporization ;
The heat of fusion is the energy required to change a solid into a liquid, while the heat of vaporization is the energy required to change a liquid into a gas. These energies are both related to the strength of the forces between molecules. In the case of the heat of fusion, these forces must be overcome in order to break the bonds between molecules and allow the liquid to form. In the case of the heat of vaporization, the molecules must be energized enough to break free from the liquid and form a gas.
Specific Heat of Fusion and Molar Heat of Fusion and Vaporization of Water
The specific heat of fusion of water is the amount of heat required to change 1 mole of water from a solid to a liquid at its melting point, and is usually expressed in joules per mole (J/mol). The molar heat of fusion of water is the amount of heat required to change the temperature of 1 mole of water by 1 degree Celsius, and is usually expressed in kilojoules per mole (kJ/mol). The specific heat of vaporization of water is the amount of heat required to change 1 mole of water from a liquid to a gas at its boiling point, and is usually expressed in joules per mole (J/mol). The molar heat of vaporization of water is the amount of heat required to change the temperature of 1 mole of water by 1 degree Celsius, and is usually expressed in kilojoules per mole (kJ/mol).
Latent heat is the energy that is needed to change the phase of a substance without changing its temperature. The specific latent heat of fusion is the energy that is needed to change the phase of a substance from solid to liquid. The specific latent heat of fusion for water is 334 joules per gram
