The melting point is the three-phase point under normal conditions. At this temperature point, taking naphthalene as an example, naphthalene vapor, solid naphthalene and liquid naphthalene reach equilibrium. In the process of changing a liquid into a solid, the vapor pressure does not change.

粗萘的純度要低一些，因此同樣溫度下，液態的粗萘蒸汽壓更低，這樣就出現了冷凝成為萘晶體之后蒸汽壓更高，這顯然是不可能存在的，因此只有在更低的溫度下才會出現三相點，凝結之后的蒸汽壓保持不變，體現的結果是熔點下降。

The purity of crude naphthalene is lower, so at the same temperature, the vapor pressure of liquid crude naphthalene is lower, so that the vapor pressure is higher after condensation into naphthalene crystals, which is obviously impossible. Therefore, only at a lower temperature can a triple point occur, and the vapor pressure after condensation remains unchanged, reflecting the result that the melting point decreases.

事實上，所有的晶體加入雜質后，熔點都會降低。

In fact, the melting point of all crystals will decrease after impurities are added.

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