Benchtop measurement systems have emerged as powerful tools in the ongoing quest for thermophysical property data. We demonstrate that these instruments can yield results of high quality if operated in an informed manner. The importance of sample purity, reproducibility over repeatability, expanded calibration and adjustment protocols, and rigorous uncertainty estimates are emphasized. We report measurement results at ambient atmospheric pressure and temperatures from 343 K to 278 K, including expanded uncertainty estimates, for the density and speed of sound of isooctane and for the speed of sound of toluene. These data are useful for validating the performance of such instruments.
Compounds
#
Formula
Name
1
C7H8
toluene
2
C8H18
2,2,4-trimethylpentane
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
Speed of sound, m/s ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Liquid
Sing-around technique in a fixed-path interferometer
14
POMD
2
Mass density, kg/m3 ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Liquid
VIBTUB:mpoint
14
POMD
2
Speed of sound, m/s ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Liquid
Sing-around technique in a fixed-path interferometer