Isobaric Properties for Water
- Fluid Data
- Auxiliary Data
- Additional Information
- Important Information About This Data
- Other Data Available:
The following adjustments were made to the specified data range:
- The specified range was adjusted to match the range of available data.
Isobaric Data for P = 1.0000 bar
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Reference States, default for fluid
|Enthalpy||H = 45.957191 kJ/mol at 26.9 C and 0.010 bar.|
|Entropy||S = 164.005224 J/mol*K at 26.9 C and 0.010 bar.|
Additional fluid properties
|Critical temperature (Tc)||373.946 C|
|Critical pressure (Pc)||220.640 bar|
|Critical density (Dc)||17873.727996 mol/m3|
|Normal boiling point||99.9743 C|
|Dipole moment||1.855 Debye|
Equation of state and auxiliary model
Wagner, W.; Pruss, A., The IAPWS formulation 1995 for the thermodynamic properties of ordinary water substance for general and scientific use, J. Phys. Chem. Ref. Data, 2002, 31, 2, 387-535. [all data]
Saul, A.; Wagner, W., A Fundamental Equation for Water Covering the Range From the Melting Line to 1273 K at Pressures up to 25000 MPa, J. Phys. Chem. Ref. Data, 1989, 18, 4, 1537-1564. [all data]
IAPWS, Revised Release on the IAPS Formulation 1985 for the Thermal Conductivity of Ordinary Water Substance, International Association for the Properties of Water and Steam, London, 1998, 23, retrieved from http://www.iapws.org/relguide/thcond.pdf. [all data]
Thermal conductivity and viscosity
Kestin, J.; Sengers, J.V.; Kamgar-Parsi, B.; Levelt Sengers, J.M.H., Thermophysical Properties of Fluid H2O, J. Phys. Chem. Ref. Data, 1984, 13, 1, 175-183. [all data]
IAPWS, Revised Release on the IAPS Formulation 1985 for the Viscosity of Ordinary Water Substance, International Association for the Properties of Water and Steam, Erlangen, Germany, 1997, 15, retrieved from http://www.iapws.org/relguide/visc.pdf. [all data]
International Association for the Properties of Water Steam, Viscosity of thermal conductivity of heavy water substance in Physical Chemistry of Aqueous Systems: Proceedings of the 12th International Conference on the Properties of Water and Steam, Orlando, FL, 1994, a107-a138. [all data]
Fernandez, D.P.; Goodwin, A.R.H.; Lemmon, E.W.; Levelt Sengers, J.M.; Williams, R.C., A Formulation for the Static Permittivity of Water and Steam at Temperatures from 238 K to 873 K at Pressures up to 1200 MPa, Including Derivatives and Debye-Huckel Coefficients, J. Phys. B: At. Mol. Opt. Phys., 1997, 26, 4, 1125-1165. [all data]
Wagner, W.; Saul, A.; Pruss, A., International Equations for the Pressure Along the Melting and Along the Sublimation Curve of Ordinary Water Substance, J. Pharm. Sci, 1994, 23, 3, 515-527. [all data]
Equation of state
The uncertainty in density of the equation of state is 0.0001% at 1 atm in the liquid phase, and 0.001% at other liquid states at pressures up to 10 MPa and temperatures to 423 K. In the vapor phase, the uncertainty is 0.05% or less. The uncertainties rise at higher temperatures and/or pressures, but are generally less than 0.1% in density except at extreme conditions. The uncertainty in pressure in the critical region is 0.1%. The uncertainty of the speed of sound is 0.15% in the vapor and 0.1% or less in the liquid, and increases near the critical region and at high temperatures and pressures. The uncertainty in isobaric heat capacity is 0.2% in the vapor and 0.1% in the liquid, with increasing values in the critical region and at high pressures. The uncertainties of saturation conditions are 0.025% in vapor pressure, 0.0025% in saturated liquid density, and 0.1% in saturated vapor density. The uncertainties in the saturated densities increase substantially as the critical region is approached.
For the uncertainties in the thermal conductivity, see the IAPWS Release.
For the uncertainties in the viscosity, see the IAPWS Release.
For the uncertainties in surface tension, see the IAPWS Release.
Important Information About This Data
The data above are from an older version of the NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP version 7). We will be updating our site to use the newer version (version 9.1) of this database in the the next couple of months. Information on REFPROP version 9.1 can be found here. REFPROP version 9.1 includes additional data and features not available from this site.
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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