Thermodynamic properties of acetone calculated from accurate experimental speed of sound measurements at low temperatures and high pressures

Thermodynamic properties of fluids are both required for designing and implementing industrial processes and in different research fields; in particular they play a fundamental role in the development of equations of state (EoS). This paper describes very accurate speed of sound measurements in liquid-phase acetone along eleven isotherms in the temperature range of (248.15 and 298.15) K and over a wide range of pressure (up to 100 MPa). Since very accurate direct measurements of the fluids properties (like density and isobaric heat capacity) are relatively easy at atmospheric pressure, but difficult at elevated pressures, a combination of speed of sound measurements and numerical integration offers a well balanced approach to determine the thermodynamic properties of liquids. In this case, density and heat capacity of the liquid at high pressures are calculated by numerical integration of u−2(p, T), using, as initial values, the same quantities (density and heat capacity) at atmospheric pressure as a function of temperature. The experimental values of speed of sound are subjected to an overall estimated uncertainty of about 0.1%.