14.3.2—Specific latent heat and distinguish between specific latent heat of fusion

Specific latent heat L is energy required per kilogram to change state at constant temperature: E=mL. Fusion melts solid to liquid; vaporisation changes liquid to gas.

During the phase change, energy changes intermolecular potential-energy store rather than raising temperature.

Melting 0.20 kg of ice at its melting point requires E=mL_f, while its temperature remains constant during the melt.

Latent heat is not “hidden temperature”; it is energy transferred during a state change, and fusion/vaporisation have different values.