Determination of the Relative Permittivity of Octane at Temperatures between (303 and 393) K and Pressures below 25 MPa with a Concentric Cylinder Capacitor at a Frequency of 1 kHz
Pirolli, L.[Laurent], Goodwin, A. R. H.[Anthony R. H.]
The relative permittivity, er(T, p), of liquid octane has been determined with an estimated expanded relative uncertainty of +- 0.018 % from measurements of the complex capacitance of a concentric cylinder capacitor at temperatures between (293 and 393) K and pressures below 25 MPa. The measurements were corrected for the capacitor s isothermal compressibility that was determined by comparison of measurements of er(He, 303 K and 393 K, p) with ab initio results from quantum mechanics. The measured er(C8H18, T, p) were combined with the amount-of-substance density, ?, which was obtained from the equation of state reported by Span and Wagner (Int. J. Thermophys. 2003, 24, 41 109), to calculate the molar polarizability, P, that was fit with an expanded (k = 2) relative uncertainty of +- 0.01 % to a correlation with three parameters. The er(T, p) obtained from the literature were converted to P*? and compared with our correlation and found to differ by less than +- 0.2 % at temperatures that overlap ours.
Compounds
#
Formula
Name
1
C8H18
octane
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.
Type
Compound-#
Property
Variable
Constraint
Phase
Method
#Points
POMD
1
Relative permittivity at various frequencies ; Liquid