(1) Naphthalene is a colorless flaky crystal with a melting point of 80.5 ℃ and a boiling point of 218 ℃. It has a special smell and is easy to sublimate.

（2）不溶于水，易溶于熱的乙醇和乙醚。

(2) Insoluble in water, soluble in hot ethanol and ether.

（3）萘是重要的化工有機(jī)原料，也常用作防蛀劑。

(3) Naphthalene is an important chemical organic raw material, and is also commonly used as a mothproof agent.

晶體特征：

Crystal characteristics:

（1）在加熱過(guò)程中，固態(tài)的萘溫度逐漸升高，開(kāi)始熔化；

(1) During the heating process, the temperature of solid naphthalene gradually increased and began to melt;

（2）熔化過(guò)程，在這個(gè)過(guò)程中雖然繼續(xù)加熱，但是溫度不變，這個(gè)溫度就是萘的熔點(diǎn)，萘的熔點(diǎn)是80℃；

(2) In the melting process, although the heating continues, the temperature remains unchanged. This temperature is the melting point of naphthalene, which is 80 ℃;

（3）繼續(xù)加熱，萘熔化完畢，液態(tài)萘隨著加熱將繼續(xù)升溫。

(3) Continue heating, naphthalene will melt, and liquid naphthalene will continue to heat up with heating.

主要用途：

Main purpose:

（1）萘是工業(yè)上最重要的稠環(huán)烴，主要用于生產(chǎn)苯酐；各種萘酚；萘胺等，是生產(chǎn)合成樹(shù)脂；增塑劑；染料的中間體；表面活性劑；合成纖維；涂料；農(nóng)藥；醫(yī)藥；香料；橡膠助劑和殺蟲(chóng)劑的原料。

(1) Naphthalene is the most important polycyclic hydrocarbon in industry, mainly used for the production of phthalic anhydride; Various naphthols; Naphthylamine is used to produce synthetic resin; Plasticizer; Dye intermediates; Surfactant; Synthetic fiber; Paint; pesticides; Medicine; Spices; Raw materials for rubber additives and pesticides.

（2）用于制造染料中間體、樟腦丸、皮革和木材保護(hù)劑等。

(2) It is used to manufacture dye intermediates, camphor balls, leather and wood protectants, etc.