Question

When a solid melts, its temperature remains constant, so where does the heat energy go?

Answer 1

Melting point is the temperature at which a solid changes into liquid. The temperature remains constant till all solid melts into liquid. This is because the heat that is supplied for changing a solid state into its liquid state is used for breaking up the particle-particle force of attractions between them. The solid substance thus absorbs heat energy (also called hidden heat or latent heat) without showing any rise in temperature till the entire solid is converted to liquid.