丙烯酸 Traditional form: 丙烯酸 Pinyin (reading): bǐngxīsuān Definitions: acrylic acid C3H4O2 Characters: 丙 - third; 3rd heavenly stem 烯 - alkene 酸 - tart, sour; spoiled; acid Traditional characters: 丙 - third; 3rd heavenly stem 烯 - alkene 酸 - tart, sour; spoiled; acid