低沸点的液体，它在低温（冷冻温度）下汽化以吸收热量，即产生冷冻；它在高温（一般为室温）下冷凝，放出热量然后以水冷法或风冷法排除此热量。冷是一种冻循环及冷冻机所用的介质。
n. refrigerant ; coolant ; cryogen
misc. freezing mixture
氢是温度最低的冷冻剂。
在冷冻系统中，液体冷冻剂快速蒸发而吸热产生冷却效果。
In a refrigeration system, the cooling is produced as the rapid evaporation of the liquid refrigerant absorbs heat.
配备有热气流旁通阀的冷冻式干燥器其冷冻剂压缩机不会频繁地开启和停机。
Equipped with heat flow bypass valve of freezing drying the coolant compressor is not frequently open and shut down.
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