A liquid, such as liquid nitrogen, that boils at a temperature below about110 K(-160=C) and is used to obtain very low temperatures; a refrigerant.

• 致冷剂一种液体，如液化氮，大约在110K（摄氏－160度）以下的温度时发生汽化，被用来获取极低的温度；冷冻剂