The compressed liquid viscosities of heptafluoropropyl methyl ether
(HFE-7000), methoxy-nonafluorobutane (HFE-7100), ethoxy-nonafluorobutane
(HFE-7200), and 2-trifluoromethyl-3-ethoxydodecafluorohexane (HFE-7500)
were measured using a vibrating- wire viscometer over the temperature
range of (253 to 373) K and at pressures from (0.1 to 30) MPa. The
combined expanded uncertainty of the reported viscosity is about 2
% with a confidence level of 0.95 (k = 2). The experimental
data were correlated with the empirical Andrade–Tait equation
which could reproduce the results with average absolute percentage
deviations of 0.44 %, 0.38 %, 0.56 %, and 0.56 %, respectively.
The
compressed liquid viscosities of 2-methylpentane, 3-methylpentane,
and 2,3-dimethylbutane were measured using a vibrating-wire viscometer
over the temperature range of (273 to 343) K and at pressures up to
40 MPa. The combined expanded uncertainty of the reported viscosity
is about 2% with a confidence level of 0.95 (k =
2). An empirical Andrade–Tait equation was used to correlate
the viscosity as a function of temperature and pressure with average
absolute percentage deviations of 0.19%, 0.23%, and 0.25%, respectively.
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