The melting point of a substance is the temperature at which a solid becomes a liquid. It is equal to the freezing point, or the point at which a liquid becomes a solid. This melting or liquefaction point is different for different kinds of materials or elements in the periodic table. This is largely to do with the atomic number of a substance and how it reacts to atmospheric pressure.
The melting point of a substance is an important physical property of a substance or compound as it helps to identify a substance and how pure it is. The melting point is helpful in identifying atomic structure in a material as well, by both the size of a molecule and the force of attraction between molecules. Due to the fact that heat effects these, the melting point is important to know.
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