Abstract
Quasi-isochoricpπT measurements onn-heptane vapor were carried out in the low density region using an improved apparatus that was originally proposed by Opel and Schaffenger (Wiss. Z. Univ. Rostock N18:871, 1969). The experimental results extend over the temperature range between 350 and 600 K and the density range between 11.5 and 52.2 mol · m−3. Above 473 K a small but significant influence of decomposition was found. Accordingly, a correction scheme assuming a trace of decomposition products was applied to these data. Second virial coefficients were derived with an assumed maximum uncertainty of ±3%.. The results are compared with others in the literature and used to develop an improved correlation function for the temperature dependence ofB(T).
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Millat, J., Hendl, H. & Bich, E. Quasi-isochoricpπT measurements and second virial coefficient ofn-heptane. Int J Thermophys 15, 903–920 (1994). https://doi.org/10.1007/BF01447101
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DOI: https://doi.org/10.1007/BF01447101