Isothermal Properties for Argon
- 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 increment was adjusted to limit the number of points calculated.
- Default values were used in place of limits which were not entered.
Isothermal Data for T = 273.16 K
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Reference States, default for fluid
|Enthalpy||H = 6.18938 kJ/mol at 298.15 K and 0.1000 MPa.|
|Entropy||S = 154.826 J/mol*K at 298.15 K and 0.1000 MPa.|
Additional fluid properties
|Critical temperature (Tc)||150.687 K|
|Critical pressure (Pc)||4.8630 MPa|
|Critical density (Dc)||13.4074 mol/l|
|Normal boiling point||87.302 K|
|Dipole moment||0.0 Debye|
Equation of state, auxiliary model, and melting curve
Tegeler, Ch.; Span, R.; Wagner, W., A New Equation of State for Argon Covering the Fluid Region for Temperatures from the Melting Line to 700 K at Pressures up to 1000 MPa, J. Phys. Chem. Ref. Data, 1999, 28, 3, 779-850. [all data]
Stewart, R.B.; Jacobsen, R.T., Thermodynamic Properties of Argon from the Triple Point to 1200 K at Pressures to 1000 MPa, J. Phys. Chem. Ref. Data, 1989, 18, 2, 639-798. [all data]
Younglove, B.A., Thermophysical Properties of Fluids. I. Argon, Ethylene, Parahydrogen, Nitrogen, Nitrogen Trifluoride, and Oxygen, J. Phys. Chem. Ref. Data, 1982, 11, 1-11. [all data]
Perkins, R.A.; Friend, D.G.; Roder, H.M.; Nieto de Castro, C.A., Thermal Conductivity Surface of Argon: A Fresh Analysis, Int. J. Thermophys., 1991, 12, 6, 965-984. [all data]
Auxiliary model and viscosity
Younglove, B.A.; Hanley, H.J.M., The Viscosity and Thermal Conductivity Coefficients of Gaseous and Liquid Argon, J. Phys. Chem. Ref. Data, 1986, 15, 4, 1323-1337. [all data]
Lemmon, E.W.; Penoncello, S.G., The Surface Tension of Air and Air Component Mixtures, Adv. Cryo. Eng., 1994, 39, 1927-1934. [all data]
Equation of state
The estimated uncertainty in density is less than 0.02% for pressures up to 12 MPa and temperatures up to 340 K with the exception of the critical region and less than 0.03% for pressures up to 30 MPa and temperatures between 235 and 520 K. Elsewhere, the uncertainty in density is generally within 0.2%. In the region with densities up to half the critical density and for temperatures between 90 and 450 K, the estimated uncertainty of calculated speeds of sound is in general less than 0.02%. In the liquid and supercritical regions, the uncertainty is less than 1%. The uncertainty in heat capacities is within 0.3% for the vapor and 2% for the liquid. The formulation gives reasonable extrapolation behavior up to very high pressures (50 GPa) and temperatures (17000 K).
The uncertainty in thermal conductivity is 2%.
The uncertainty in viscosity is 2%, except in the dilute gas, where the uncertainty is 0.5%.
The uncertainty in thermal conductivity is 2.2%.
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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