The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point. The melting point of a solid is an indication of
strength of the intermolecular forces of attraction
strength of the intermolecular forces of repulsion
molecular mass
molecular size
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UPSC NDA-1 – 2016
The melting point of a solid is the temperature at which it transitions from the solid state to the liquid state. In the solid state, particles are held together by intermolecular forces of attraction (or interatomic/interionic forces in the case of network solids or ionic compounds). Melting requires supplying enough thermal energy to overcome these forces, allowing the particles to move more freely as a liquid. A higher melting point indicates that stronger attractive forces exist between the particles in the solid, requiring more energy to break them apart.