Latent heat of fusion (ΔSfus) is basically the amount of energy required to melt one gram of a solid without changing its temperature.
Latent heat of vaporisation (ΔSvap) is basically the amount of energy required to vaporise (boil) one gram of a liquid without changing the pressure.
The strong intermolecular forces between liquid molecules are broken during vaporisation, converting the liquid to vapour. Thus, more energy is required to break the intermolecular attraction of liquid molecules than to simply weaken the bonds in solid to convert it to liquid (during fusion). As a result, a substance's latent heat of vaporisation is always greater than its latent heat of fusion.
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