Only one . . . . . heat energy.
energy is required
The energy required to change a solid to a liquid at the melting point is known as the heat of fusion or melting. This energy is used to break the intermolecular forces holding the solid together and transition it into a liquid state.
The energy required to melt a substance. (Apex)
Heating can change matter from a solid to a liquid or from a liquid to a gas. Cooling can change matter from a gas to a liquid or from a liquid to a solid.
When a substance is below the triple point, the equilibrium will be between solid and vapor rather than solid/liquid or liquid/vapor. Sublimation is the direct change from solid to vapor without any intermediate phase change. The latent heat of sublimation is the energy required to change a given quantity of solid into the vapor at equilibrium. It is analogous to (but not the same as) latent heat of melting (energy required to melt the solid to liquid) and latent heat of vaporization (energy required to change a liquid into a gas).
The amount of energy required to change from a liquid to a solid is called the heat of fusion. This energy is needed to disrupt the intermolecular forces holding the particles in a liquid state and rearrange them into a solid structure. It is also known as the latent heat of fusion.
To change a solid to a liquid, heat needs to be applied to the solid until it reaches its melting point. At this point, the solid absorbs heat energy, causing its particles to gain enough energy to overcome the forces holding them in a fixed position, and allowing them to move freely, resulting in the solid turning into a liquid.
It is the amount of energy required to change 1kg of solid into a liquid with no temperature change.
change of a liquid to a solid
The change from liquid to solid is called freezing.
Melting is a physical change, a transformation from solid to liquid.
Sure, change from solid to liquid is a physical change