Yes, the temperature at which a substance melts is the same temperature at which it changes from liquid to solid. This temperature is known as the melting point of the substance. At the melting point, the solid and liquid phases of the substance are in equilibrium, meaning that they can coexist without any net change in the amount of each phase.

The melting point of a substance is a characteristic property, meaning that it is the same for all samples of the same substance under the same conditions. The melting point can be used to identify substances and to study their properties.

The melting point of a substance is affected by a number of factors, including the pressure, the presence of impurities, and the size of the sample. However, under standard conditions, the melting point of a substance is a constant value.