Passage: The first air conditioners and refrigerators employed toxic or flammable gases, such as ammonia, methyl chloride, or propane, that could result in fatal accidents when they leaked. Thomas Midgley, Jr. created the first non-flammable, non-toxic chlorofluorocarbon gas, Freon, in 1928. Jina ni jina la alama ya biashara inayomilikiwa na DuPont kwa yoyote chlorofluorocarbon (CFC), hydrochlorofluorocarbon (HCFC), au hydrofluorocarbon (HFC) refrigerant. Majina ya refrigerant ni pamoja na idadi inayoonyesha muundo wa Masi (kwa mfano, R-11, R-12, R-22, R-134A). Mchanganyiko unaotumiwa zaidi katika upanuzi wa moja kwa moja wa nyumba na faraja ya baridi ya jengo ni HFC inayojulikana kama chlorofluoromethane (R-22). Swali: Majina yanaonyesha nini?
muundo wa molekuli