Melting Points Aliphatic acids with more than 8 carbons are solids at room temperature. Double bonds (especially cis)lower the melting point.Note these 18-C acids: ●Stearic acid(saturated):72c硬脂酸 ●Oleic acid(one cis double bond):l6C油酸 ●Linoleic acid(two cis double bonds):-5c亚油酸 COOH COOH stearic acid,mp 70C oleic acid,mp 4C Melting Points Aliphatic acids with more than 8 carbons are solids at room temperature. Double bonds (especially cis) lower the melting point. Note these 18-C acids: Stearic acid (saturated): 72  C硬脂酸 Oleic acid (one cis double bond): 16  C油酸 Linoleic acid (two cis double bonds): -5  C亚油酸 硬脂酸,油酸,亚油酸