Second virial coefficients in vapor systems: Insights from air and argon mixtures

Abstract

The second virial coefficient is a crucial parameter in understanding intermolecular interactions and non-ideal behavior in gas mixtures. This study focuses on evaluating the second virial coefficients of vapor mixtures with air and argon. The coefficients, ranging from -20 °C to 100 °C, are provided in comparative tabulations together with the corresponding uncertainties. It is possible to build a very accurate pair potential for the Ar-H2O mixture based on initial quantum calculations in order to achieve a lower uncertainty in the second virial coefficient than that which is derived from an experiment.The air-water mixture's uncertainty from the vapor-liquid water isothermal equilibrium experiment matches the air-water mixture's uncertainty from the alphabet calculations.These mixtures are essential in various industrial applications, including environmental monitoring, cryogenics, and aerospace technologies. Using a combination of empirical data and theoretical models, the research investigates the deviations from ideal gas behavior, providing insight into the interactions between vapor molecules and air or argon. Results indicate significant influence from intermolecular forces and temperature variations, offering improved predictive models for real-world applications.