Form of a Wide-Range Vapor Pressure Equation

Thermodynamic properties of pyridine—I. Vapor pressures, high-temperature heat capacities, densities, critical properties, derived thermodynamic functions, vibrational assignment, and derivation of recommended values

“…(25,40) T/Κ The findings by Wagner and coworkers are in complete accord with those of the present research. The various forms of the Wagner equation all satisfy the Waring criterion, (41) with an inflection point observed in a plot of ln(p/p c ) against (1/T ) near T r =0.86. Differences between vapor pressures calculated with the (2.5, 5) form and the (2, 4) form of the Wagner equation at temperatures above T=430 K reach a maximum of 0.9 per cent near T=570 K. The experimental vapor pressures in this temperature region reported by Kobe et al (4) are not of sufficient precision to determine which form is preferred at high reduced temperatures.…”

Similarity law for Widom lines and coexistence lines

“…Waring [27] suggested an exact rearrangement, using the compressibility factor Z = pv/RT with the gas constant…”

Thermodynamic properties of methylquinolines: Experimental results for 2,6-dimethylquinoline and mutual validation between experiments and computational methods for methylquinolines

“…The critical temperature (T c = 786 K) measured in this research was used in the fits. The critical pressure p c = 3480 kPa was selected with Waring's criterion for T r = 0.85 [39]. Application of this criterion was discussed previously by Steele [30].…”