Thermodynamics Research Center / ThermoML | International Journal of Thermophysics

Speed of Sound in Pure Water at Temperatures between 274 and 394K and at Pressures up to 90 MPa1

Benedetto, G., Gavioso, R. M., Giuliano Albo, P. A., Lago, S.[Santiago], Madonna Ripa, D., Spagnolo, R.
Int. J. Thermophys. 2005, 26, 6, 1667-1680
A newly designed experimental apparatus has been used to measure the speed of sound u in high-purity water on nine isotherms between 274 and 394K and at pressures up to 90MPa. The measurement technique is based on a traditional double-reflector pulse-echo method with a single piezoceramic transducer placed at unequal distances from two stainless steel reflectors. The transit times of acoustic pulse are measured at a high sampling rate by a digital oscilloscope. The distances between the transducer and the reflectors were obtained at ambient temperature and pressure by direct measurements with a coordinate measuring machine. The speeds of sound are subject to an overall estimated uncertainty 0.05 %. The acoustic data were combined with available values of density n and isobaric heat capacity cp along one isobar at atmospheric pressure to calculate the same quantities over the whole temperature and pressure range by means a numerical integration technique. These results were compared with those calculated from the IAPWS-95 formulation with corresponding relative deviations which are within 0.1%.
# Formula Name
1 H2O water
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)
  • Pressure, kPa; Fluid (supercritical or subcritical phases)
  • Temperature, K; Fluid (supercritical or subcritical phases)
  • Fluid (supercritical or subcritical phases)
  • Pulse-echo method
  • 90