Q: The latent heat of fusion of substance is always less than the latent heat of vaporization or latent heat of sublimation of the same substance . Explain .
Sol: During a change of state , the latent heat absorbed is equal to the difference between the binding energies of the two states . Among solids , liquid and gases the binding the binding energy is maximum for solids and minimum for gases . The difference in binding energy of the gaseous and liquid states is much greater than the difference between the binding energy of solid and liquid states .