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

Measurements leading to the calculation of standard thermodynamic properties for pyridine (Chemical Abstracts registry number 110-86-1) are reported for temperatures from the triple-point temperature T tp=231.51 K to T=560 K. The standard state is defined as the ideal gas at the pressure p p= o=101.325 kPa. Vapor pressures were measured by comparative ebulliometry for the pressure range kPa to 270 kPa (temperature range: T=319 K to T=426 K). Two-phase (liquid+vapor) heat capacities were measured for the temperature range 300