Pressure Coefficients of Acoustic Velocity for Nine Organic Liquids

With a pressure supersonic interferometer especially devised for this purpose, nine organic liquids are examined at frequencies a little less than 200 kc and at temperatures varying from 22.7°C to 25.5°C for the various liquids. The acoustic velocity is measured at intervals from atmospheric pressure to a pressure of 300 kg/cm². The values of the acoustic velocity (in meters per second) in the liquids at the pressures indicated are given below: $$\begin{array}{cccccccccc}\mathrm{Liquid}& {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Br}& \mathrm{C}\hspace{0.17em}{\mathrm{Cl}}_4& {\mathrm{CHCl}}_3& {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{O}{\mathrm{C}}_2{\mathrm{H}}_5& {\mathrm{C}}_5{\mathrm{H}}_{12}& {\mathrm{CS}}_2& {\mathrm{C}}_6{\mathrm{H}}_6& {\mathrm{C}}_7{\mathrm{H}}_8& {\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NH}}_2\\ \mathrm{Atmospheric\hspace{0.17em}Pressure}& \text{885.}& \text{912.}& \text{986.}& \text{993.}& \text{1005.}& \text{1136.}& \text{1290.}& \text{1313.}& \text{1640.}\\ {\text{300\hspace{0.17em}kg/cm}}^2\mathrm{\hspace{0.17em}Pressure}& \text{1000.}& \text{1048.}& \text{1097.}& \text{1255.}& \text{1281.}& \text{1268.}& \text{1416.}& \text{1447.}& \text{1745.}\end{array}$$ This method is being used for the determination of the value of the specific heats at other than atmospheric pressure.