An apparatus consisting of two spherical resonators of nominal internal radius (25 and 45) mm was constructed and used to determine the speed of sound in argon at temperatures between (250 and 350) K at pressures below 7 MPa. The estimated expanded uncertainty in the speed of sound determined was less than +-0.03 m*s-1, that is, less than+-8*10-5*u, and the results obtained from both resonators agreed within the combined uncertainty. Independent measurements and predictions, obtained from an equation of state (J. Phys. Chem. Ref. Data 1999, 28, 779-850), of the speed of sound differed from the results by less than+-5*10-5*u at p less than 2.5 MPa and at p 6.8 MPa by 4*10-4*u. The second acoustic virial coefficient for argon obtained from both resonators agrees within the combined expanded uncertainty except at T = 350 K where the difference is about three times the combined expanded error.
Compounds
#
Formula
Name
1
Ar
argon
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 ; Fluid (supercritical or subcritical phases)
Temperature, K; Fluid (supercritical or subcritical phases)
Pressure, kPa; Fluid (supercritical or subcritical phases)