Question

What is latent heat of vaporisation and latent heat of fusion?

Answer 1

The first is the amount of heat needed to vaporize a liquid or sublime a solid, per unit mass. (Sublimation occurs when a material goes directly from solid to vapor). Temperature remains constant while the phase change occurs.

The second, latent heat of fusuion, is the heat needed to melt a solid (at its melting point temperature), per unit mass.