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The melting point is defined as the constant temperature at which a substance changes from a solid state to a liquid state; Each pure solid has its own melting point, which is different from other substances; For example, the melting point of snow is zero Celsius, and the reverse process of melting is freezing, which transforms the material from the liquid state to the solid state by losing heat through cooling; Since the loss of heat from a liquid substance causes its molecules to get closer to each other, and hold together more, and the forces of attraction between them increase, and the melting point of a pure solid is constant, the freezing point is equal to the melting point of the same substance.

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