Related Experiment Video
Updated: Aug 2, 2026

Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique
Published on: June 12, 2015
Free volume and density and temperature dependence of diffusion coefficients of liquid mixtures
1Department of Chemistry and Centre for the Physics of Materials, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada.
Abstract:
A simple formula for the diffusion coefficient of liquid mixtures, expressed in terms of the work necessary to create a characteristic free volume in the liquid, is presented in the spirit of the Arrhenius activation theory and tested in comparison with available experimental data. If use is made of the generic van der Waals equation of state, the free volume appearing in the formula for the diffusion coefficient can be expressed in terms of the equilibrium pair correlation functions. The theoretical values for diffusion coefficients agree excellently with experimental values with regard to the density and temperature dependence of the diffusion coefficients of argon and krypton.
Related Concept Videos
Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion
Density
Viscosity
The SI unit of viscosity is...
Distribution of Molecular Speeds
Thermodynamic Properties of Ideal Solutions
Viscosity

