Latent heat of fusion , Lf of a solid is the heat required to change it from solid to liquid state or vice versa without any change in temperature. The unit for Lf is the joule(J). The latent heat of an object depends on its mass.
The specific latent heat of fusion, lf of a solid is the heat required to change one kg of it from solid to liquid or vice versa without any change in temperature. The unit for lf is joule per kg (J kg-1).
Lf = lf × m
Latent heat of vaporisation , Lv of a solid is the heat required to change it from liquid to vapour state or vice versa without any change in temperature. The unit for Lv is the joule(J). The latent heat of an object depends on its mass.
38 The specific latent heat of fusion, lv of a liquid is the heat required to change 1 kg of it from liquid to vapour or vice versa without any change in temperature. The unit for lv is joule per kg (J kg-1).
Lv = lv × m