The melting point (or, rarely, liquefaction point) of a solid is the temperature at which it changes state from solid to liquid at atmospheric pressure. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at standard pressure.
When solid materials are heated, the temperature at which change of state from solid to liquid occurs it the melting point
Melting Point of Solids/ Change of State
When solids are exposed to high temperature, change of state from solid to liquid and to gaseous state if continuous heat is being added.
The point when the change of state from solid to liquid occurred is described as the melting point of that solid
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