氯乙烯 Traditional form: 氯乙烯 Pinyin (reading): lüyǐxī Definitions: vinyl chloride (chloroethene C2H3Cl) Characters: 氯 - chlorine 乙 - second; 2nd heavenly stem 烯 - alkene Traditional characters: 氯 - chlorine 乙 - second; 2nd heavenly stem 烯 - alkene