Latent heat is the energy needed to change the state of a substance without changing its temperature. It goes into breaking (or forming) bonds between particles rather than increasing kinetic energy.
Latent heat of fusion: energy for solid to liquid (or released for liquid to solid).
Latent heat of vaporisation: energy for liquid to gas (or released for gas to liquid). This is always larger than the latent heat of fusion for the same substance because the particles must be completely separated.
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