Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Shigowa: Aikin sanyaya iska da kuma firiji na farko sun yi amfani da iskar gas mai guba ko mai kamawa, kamar ammoniya, methyl chloride, ko kuma propane, wanda zai iya jawo hatsari mai kisa idan ya zube. Thomas Midgley, Jr. ya kirkiro iskar gas mai guba mai guba, mai guba mai guba, Freon, a 1928. Sunan alama ce ta kasuwanci mallakar DuPont ga kowane chlorofluorocarbon (CFC), hydrochlorofluorocarbon (HCFC), ko hydrofluorocarbon (HFC) mai sanyaya. Sunaye masu sanyaya sun haɗa da lamba wanda ke nuna tsarin kwayoyin (misali, R-11, R-12, R-22, R-134A). Haɗin da aka fi amfani da shi a cikin gida mai faɗakarwa kai tsaye da kuma ginin jin daɗin jin daɗi shine HCFC da aka sani da chlorodifluoromethane (R-22).  Tambaya: Menene sunayen suke nufi?
Tsarin kwayoyin halitta