Related Experiment Video
Updated: May 11, 2026

High-pressure Sapphire Cell for Phase Equilibria Measurements of CO2/Organic/Water Systems
Published on: January 24, 2014
Isentropic compressibilities--experimental origin and the quest for their rigorous estimation in thermodynamically
G Douhéret1, M I Davis, J C Reis
1Laboratoire de Thermodynamique des Solutions et des Polymères, UMR, CNRS 6003, Université Blaise Pascal, 63177 Aubière Cedex, France. Gerard.Douheret@univ-bpclermont.fr
Abstract:
In this review, attention is initially focused upon the evolution of the Newton-Laplace Equation, that links the measured speed of sound in a fluid in conjunction with its density, to a reliable estimate of its isentropic compressibility κS. Definitions of ideal and excess isentropic quantities are formulated on the premise that the thermodynamic properties of an ideal mixture are mutually related in the same manner as are those of a real mixture or a pure substance. It is shown that both intensive and extensive properties can be derived from the ideal Gibbs energy. Different approaches previously used to calculate ideal isentropic quantities are examined and some subtle errors are identified. The consequences of using conflicting definitions are pointed out. Isentropic pressure derivatives obtained under different conditions and empirical models for estimating the differences between ultrasonic speeds in real and ideal liquid mixtures are discussed.
More Related Videos
10:12Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique
Published on: June 12, 2015
10:28Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
Published on: January 3, 2014
Related Concept Videos
Thermodynamic Properties of Ideal Solutions
Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation
Deviation from Ideal Behaviour
pV-Diagrams
The Thermodynamics of Mixing
Ideal Solutions or Mixtures