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Time dependence in “static” measurements of vapor pressure

Published

Author(s)

Robert F. Berg

Abstract

The static method for measuring vapor pressure assumes that the sample is pure and that its temperature is steady and uniform. In practice, the measured pressure may be time dependent due to evaporative cooling after pumping on the sample, transpiration of the sample in a temperature gradient, or diffusion of an impurity out of the sample. An impurity cannot be avoided if the sample is decomposing. This article discusses causes of time dependence, and it includes an analysis that obtained the vapor pressure from the time-dependent pressure of a decomposing sample.
Citation
Journal of Chemical and Engineering Data
Volume
60

Keywords

cyclic pumping, decomposition, diffusion, evaporative cooling, time-dependent pressure, transpiration, vapor pressure

Citation

Berg, R. (2015), Time dependence in “static” measurements of vapor pressure, Journal of Chemical and Engineering Data, [online], https://doi.org/10.1021/acs.jced.5b00752 (Accessed May 24, 2022)
Created November 17, 2015, Updated November 10, 2018