the fluid used for heat transfer in a refrigerating system, which absorbs heat at a low temperature and a low pressure of the fluid and rejects heat at a higher temperature and a higher pressure of the liquid, usually involving changes of state of the fluid, the working fluid in a refrigeration cycle, absorbing heat from bodies at low temperature and rejecting heat to bodies at a higher temperature, külmutusseadme, kliimaseadme jmt tööaine, mis kannab edasi energiat, võttes keemisel ja isotermilisel paisumisel jahutatavalt keskkonnalt soojust vastu ja pärast kokkusurumist andes veeldumisel soojust edasi