We report on the implementation of a dynamical method for the determination-in an extended temperature range around room temperature-of the saturation vapor pressure and enthalpy of vaporization of low-volatility liquid substances. The method relies on isolating a precooled substance in a heated chamber under static vacuum conditions and monitoring the chamber pressure as the sample slowly thermalizes to the chamber temperature. We apply the method to four reference substances-diethyl phthalate, 1-decanol, 1-heptanol, and 1-hexanol-and provide accurate data for their saturation vapor pressure and enthalpy of vaporization in the range from -10 to 35 °C.
Salimi et al. (Sun,) studied this question.