Speed of sound and density of ethanol-water mixture across the temperature range 10 to 50 degrees Celsius

Abstract

Properties such as the speed of sound and density of ethanol-water mixtures are of concern in applications such as the calibration of ultrasound imaging machines, and the study of molecular interactions in binary solutions. The speed of sound and density in ethanol-water mixtures up to a concentration of 40% (w/w) were measured across the temperature range 10 to 50 °C using an ultrasound resonator and a densitometer, with accuracies of ±0.25 m/s and ±0.05 kg/m3 respectively. Measured data were interpolated and presented in forms of multi-polynomial functions of the concentration and the temperature. The functions may serve as a database for reference and also a source to derive parameters such as the temperature coefficient of the speed, the thermal expansion coefficient, and the isentropic compressibility of the mixture, which are commonly used in physiochemical and molecular acoustics studies.