thermal energy is needed to do that job. as opposed to mechanical potential or chemical energies.
liquid
energy
The energy needed to change a substance from a liquid to a gas is called the enthalpy (or heat) of vaporization.
Thermal Energy
It is the latent heat of liquefaction.
thermol
endothermic
What are two substances that are needed for iron to rust
heat is a mesure of energy the more energy the hotter it is so depending on its melting point is how much energy/heat is needed
Usually heat is needed. but this can happen through osmosis as well.
Heat of Fusion
Changing a chocolate from soild to liquid requires the absroption of energy.