Explanation:
A point of temperature at which both solid and liquid state of a substance remains in equilibrium without any change in temperature then this temperature is known as melting point.
For example, melting point of water is [tex]0 ^{o}C[/tex]. So, at this temperature solid state of water and liquid state are present in equilibrium with each other.
Therefore, when a 100 g of given pure metal in solid state is heated at its exact melting point which is [tex]215^{o}C[/tex] then some of the solid will change into liquid state but the temperature will remains the same.