Dynamical measurement of saturation vapor pressures below and above room temperature

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 $\mathit{\text{precooled}}$ 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.