On the speed of sound and heat capacity of liquid neon in the subcritical region

TL;DR

This paper analyzes liquid neon's thermodynamic properties in the subcritical region, identifying discrepancies and proposing corrections based on fluctuation theory and thermodynamic similarity.

Contribution

It introduces a fluctuation-based correction method for experimental data of liquid neon near the coexistence curve.

Findings

Discrepancies in sound speed and heat capacities in the subcritical region.

Correction of data improves consistency with fluctuation theory.

Thermodynamic similarity aids in data evaluation.

Abstract

The data (the speed of sound, the isobaric and isochoric heat capacities as well as the heat capacity ratio) for liquid neon presented in NIST Chemistry WebBook are analyzed. It has been shown, basing on the representation of the inverse reduced volume fluctuations, that they consist of sufficient discrepancies in the subcritical region. The correction of data in this region of the coexistence curve is evaluated using the fluctuation approach and the theory of thermodynamic similarity.