The sound velocities in dilute aqueous solutions of 12 alcohols were measured at 5, 15, 25, 35, and 45 degrees C by means of a sing-around ultrasonic velocimeter. The alcohols used were methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, 2-methyl-1-propanol, 2-methyl-2-propanol, 1-pentanol, 2-methyl-2-butanol, 2,2-dimethyl-1-propanol, and 1-hexanol. From these data and density results reported previously, the apparent molar adiabatic compressions of the alcohols were evaluated. The effects of chain length and chain branching of alkyl residues on the compression behavior of alcohols in water were discussed.