A New Empirical Relation between the Enthalpy of Vaporization and (Tc − Tm) for the Liquids of Similar Chemical Groups (Tc: Critical Temperature, Tm: Melting Temperature)

Abstract

A new empirical linear relation between the enthalpy of vaporization and (Tc − Tm) (Tc: critical temperature, Tm: melting temperature) is presented for liquids of similar chemical groups. Combination of the above finding with Trouton’s rule leads to another linear relation between Tb (boiling temperature) and (Tc − Tm). As an extension, a different expression for the Guldberg rule is also derived. These findings can contribute to the understanding of general behavior of liquids and the development of theories of liquids.

Liquid–Vapor Coexistence and Spontaneous Evaporation at Atmospheric Pressure of Common Rigid Three-Point Water Models in Molecular Simulations

“…Analogously, water models with a particularly high critical temperature show a particularly high Δ H . This is not surprising as these quantities are thermodynamically linked . We find that SPC/ϵ and TIP3P-ST are the only two water models that exhibit Δ H values above the experimental curve at some temperatures.…”

“…This is not surprising as these quantities are thermodynamically linked. 71 We find that SPC/ϵ and TIP3P-ST are the only two water models that exhibit Δ H values above the experimental curve at some temperatures. This is consistent with our finding that these water models show an underestimation of the density in the vapor phase.…”