Fifty years of thermodynamics research at Bartlesville

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

“…has been described. (13,19) Measured two-phase (liquid+vapor) heat capacities for a minimum of two fillings, vapor pressures, and reliable liquid-density values are required. Table 4 The fitting procedure has been described.…”

“…Table 4 The fitting procedure has been described. (13,19) The C sat,m values determined by adiabatic calorimetry (7) for the temperature range 304Q(T/K)Q347 were included and weighted equally with the vapor pressures. These were included to ensure a smooth junction between the values determined with adiabatic calorimetry and the higher temperature results.…”

“…Details of the method were described recently. (19) The cell volume V x was calculated with the equation:…”

“…Experimental methods were described previously. (13,19) Raman and i.r. spectra for the vapor and liquid phases of pyridine were obtained with a Spex 14018 Ramalog spectrophotometer using the 514.5 nm emission of the argon laser and a Digilab FTS-20E instrument, respectively.…”

“…(13,19) The form chosen for variation of the second derivative of the chemical potential with temperature was:…”