Molecular formula :
nature : heating under pressure from certain solids so that they will reach the solid-liquid coexistence temperature (liquid down to the solid-liquid coexistence as the solidification temperature, the melting point solidification). Melting point with the pressure of the system. Solidification size reduced, the temperature increased with the pressure rise; Conversely, if the solidification expansion, the temperature increases with the pressure drop. Atmospheric pressure the melting point as normal melting point. No non-crystal determine the melting point. Crystals containing impurities, increasing the temperature interval.
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