Speeds of sound in the liquid phase of 1,1-difluoroethane, CHF2CH3 were measured by a sing-around technique operated at a frequency of 2 MHz. The results cover the temperature range along six isotherms from (243 to 333) K and pressures from near the saturation line to about 30 MPa. The combined uncertainty is estimated to be within ?0.2 % except the region near the coexistence line at the upper temperature range. The vapor pressure was also measured with an uncertainty lower than ?20 kPa by detecting the phase change using an acoustic absorption technique. The speeds of sound in the saturated liquid were estimated by the extrapolation to the vapor pressure from those in the compressed liquid. The temperature and/or pressure effects on the speed of sound are discussed and compared with data for some other hydrofluorocarbons reported elsewhere.
Compounds
#
Formula
Name
1
C2H4F2
1,1-difluoroethane
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
Vapor or sublimation pressure, kPa ; Liquid
Temperature, K; Liquid
Liquid
Gas
Closed cell (Static) method
6
POMD
1
Speed of sound, m/s ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Liquid
Sing-around technique in a fixed-path interferometer