J. Millat et al., QUASI-ISOCHORIC P-P-T-MEASUREMENTS AND 2ND VIRIAL-COEFFICIENT OF N-HEPTANE, International journal of thermophysics, 15(5), 1994, pp. 903-920
Quasi-isochoric p rho T measurements on n-heptane vapor were carried o
ut in the low density region using an improved apparatus that was orig
inally proposed by Opel and Schaffenger (Wiss. Z. Univ. Rostock N18:87
1, 1969). The experimental results extend over the temperature range b
etween 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 w
as found. Accordingly, a correction scheme assuming a trace of decompo
sition 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 imp
roved correlation function for the temperature dependence of B(T).