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While chemically pure materials have a single melting point, chemical mixtures often partially melt at the temperature known as the solidus (T_S or T_sol), and fully melt at the higher liquidus temperature (T_L or T_liq). The solidus is always less than or equal to the liquidus, but they need not coincide. If a gap exists between the solidus and liquidus it is called the freezing range,

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