A vibrating-wire viscometer of very high precision was used to measure the viscosity coefficient of gaseous sulphur hexafluoride. The experimental data were taken at subcritical temperatures of (300 and 316) K up to 90 % of the saturated vapor pressure and at supercritical temperatures of (321, 333.15, 350, 375, 400, and 425) K at pressures up to 20 MPa. The measuring values were evaluated using an equation of state by Wagner and Kurzeja. The reproducibility is +- (0.05 to 0.1) %, whereas the total uncertainty is estimated to be +- (0.25 to 0.4) % with a distinct increase approaching the critical region. The viscosity values of the isotherms were evaluated using a power series expansion in terms of density without and with logarithmic term. The existence of a quadratic term logarithmic in density could not be proven. A comparison with data from literature shows that the new values agree in the low-density range within +- 0.2 % and at higher densities apart from the near critical region within +- 0.3 % with the most reliable data.
Compounds
#
Formula
Name
1
F6S
sulfur hexafluoride
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.