Dynamical measurement of saturation vapor pressures below and above room temperature
Mohsen Salimi1, Andreas B Pedersen1, John E V Andersen1
1Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark.
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 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.
Related Concept Videos
Vapor Pressure
Vapor Pressure of Fluid
When a liquid is placed in a closed container with a small air space, and the space is evacuated, vapor molecules will...
Vapor Pressure Lowering
Clausius-Clapeyron Equation
Nonideal Two-Component Liquid Solutions
pV-Diagrams


