When melting occurs, heat is utilized to overcome intermolecular forces, enabling molecules to move freely without a temperature change until the phase change completes.
During the process of melting, the supplied heat is used to overcome the force of attraction between the molecules, allowing them to move around at comparable kinetic energies. This energy input does not result in a temperature change until the phase change is complete. Similarly, in the process of vaporization, heat is used to increase the movement between molecules rather than their kinetic energy, maintaining a constant temperature during the phase change.
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