A Measurement System for Low-Temperature Thermodynamic Properties

Details A Measurement System for Low-Temperature Thermodynamic Properties A Measurement System for Low-Temperature Thermodynamic Properties

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2501a&link_type=abstract

American Astronomical Society, DPS meeting #28, #25.01; Bulletin of the American Astronomical Society, Vol. 28, p.1157

Astronomy and Astrophysics

Astronomy

Scientific paper

Interpretation of planetary observations and proper modeling of planetary atmospheres are both critically dependent on accurate laboratory data for the properties and processes that give rise to characteristic features and phenomena. It is important that these data be taken over the appropriate range of parameters such as temperature, pressure, and composition. Thermodynamic data are particularly important for the construction of first-order equilibrium and photochemical models of clouds and hazes in the atmospheres of the outer planets. However, this information often does not exist or does not extend to the low temperatures prevalent in these environments. In the absence of the required low-temperature data modelers must extrapolate high-temperature data to the temperature range of interest which can introduce significant errors. Here we describe an apparatus that has been specifically designed to provide low-temperature thermodynamic data and present construction details and measurement strategies that have been employed. Careful consideration has been given to a variety of factors to ensure the acquisition of high-accuracy data: assessment of sample purity, high-vacuum capability, volumetric and temperature calibration, correction for thermal transpiration, and overlap of pressure measuring devices. The system is being calibrated using propane and will be used initially to measure vapor pressures of pure substances; however, the design will also allow us to measure properties of binary and tertiary mixtures, as will be discussed briefly.

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