During which process does a substance undergo a phase change from solid to liquid?

The process in which a substance changes from solid to liquid is known as melting. This occurs when the temperature of the solid increases to its melting point, allowing the particles to gain enough energy to break free from their ordered arrangement in the solid state. As a result, the substance transforms into a liquid, where the particles are still close together but can move more freely.

The other processes listed do not describe the transition from solid to liquid. Freezing is the reverse, where a liquid becomes a solid. Sublimation refers to the transition from solid directly to gas without passing through the liquid phase. Condensation describes the process through which gas changes into a liquid. Thus, melting is distinct in that it specifically signifies the transition from a solid to a liquid.