Relative permittivities (?r) have been measured at two frequencies with an expanded (k = 2) uncertainty of 0.1 using a re-entrant radio frequency resonator in the pressure range (0.1 to 5) MPa at temperatures from (278 to 328) K for N,N-dimethylformamide (DMF) and (293 to 328) K for dimethylsulfoxide (DMSO). At 298.15 K and 0.1 MPa, the assessed literature averages of 38.4 +- 1.8 and 47.3 +- 1.8 for DMF and DMSO, respectively, are consistent with the values of 37.2 +- 0.1 and 46.0 +- 0.1 determined in this work. Possible sources of uncertainty are discussed. An empirical description of ?r(p,T) is given that can be used to calculate the temperature and pressure derivatives of ?r. Kirkwood g factors calculated using the present data show only minimal dipole-dipole correlations for both DMF and DMSO.
Compounds
#
Formula
Name
1
C3H7NO
dimethylformamide
2
C2H6OS
dimethyl sulfoxide
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.