Investigation of ultrasonic velocity in organic liquids on the saturation curve

This review deals with the investigation of the ultrasonic velocity in organic liquids on the saturation curve and with analysis of the results obtained at the Kursk State University — KGU (before that, Kursk State Pedagogical Institute — KGPI) during the period from 1969 to the present day. Much attention is given to the description of the procedure of measurement of the sound velocity by the pulse-phase method developed at the Laboratory of Molecular Acoustics of the KGU and to the estimation of measurement errors. The data on the sound velocity along the saturation curve in a wide temperature range for three classes of organic liquids (saturated hydrocarbons, aliphatic alcohols, and aromatic hydrocarbons) are given in the form of tables. Characteristic features of the behavior of the sound velocity and adiabatic compressibility of liquid in the vicinity of the critical point are investigated, and the possibility of using the acoustic data for the calculation of the thermodynamic properties of liquids is studied.