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.

粗萘的纯度要低一些，因此同样温度下，液态的粗萘蒸汽压更低，这样就出现了冷凝成为萘晶体之后蒸汽压更高，这显然是不可能存在的，因此只有在更低的温度下才会出现三相点，凝结之后的蒸汽压保持不变，体现的结果是熔点下降。

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.

事实上，所有的晶体加入杂质后，熔点都会降低。

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

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