Dynamical measurement of saturation vapor pressures below and above room temperature

arXiv:2508.10932v1 Announce Type: new
Abstract: 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 textit{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 $35^circ$C.