A machine used to transfer heat from an object or space to the surroundings to produce cooling, such as compression, absorption, or steam-jet types

A substance used for cooling in refrigeration or air conditioning systems by absorbing heat, such as ammonia or chlorofluorocarbons; also called [[冷媒|冷媒|leng3 mei2]], [[致冷剂|致冷劑|zhi4 leng3 ji4]], or [[冷却剂|冷卻劑|leng3 que4 ji4]].