Systematization of the Critical Parameters of Substances due to Their Connection with Heat of Evaporation and Boyle Temperature

Abstract

We show that a variety of the critical parameters of substances can be systematized by relating them to the corresponding Boyle values and heat of vaporization under normal conditions. We have found new relationship for the critical parameters of substances obtained by processing the NIST database and other various sources. According to new relationship, the sum of the ratios of the critical and Boyle temperatures and the critical temperature to the heat of vaporization practically remains constant. The previous one (Apfelbaum and Vorob’ev in J Phys Chem B 113:3521, 2009) states that the sum of the critical temperature and density reduced to the corresponding Boyle values is also constant. Check for 70 substances from the NIST database and calculations for Mie m-6 potential confirmed these regularities within few percent accuracy.