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Isothermal Properties for Carbon dioxide

The following adjustments were made to the specified data range:

Fluid Data

Isothermal Data for T = 0.0000 C

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Auxiliary Data

Reference States, IIR Convention

Additional fluid properties


Equation of state, auxiliary model, melting curve, and sublimation curve

Span, R.; Wagner, W., A New Equation of State for Carbon Dioxide Covering the Fluid Region from the Triple-Point Temperature to 1100 K at Pressures up to 800 MPa, J. Phys. Chem. Ref. Data, 1996, 25, 6, 1509-1596. [all data]

Auxiliary model

Ely, J.F.; Magee, J.W.; Haynes, W.M., Thermophysical properties for special high CO2 content mixtures, Research Report RR-110, Gas Processors Association, Tulsa, OK, 1987, 0. [all data]

Auxiliary model

McCarty, R.D., Correlations for the Thermophysical Properties of Carbon Monoxide, National Institute of Standards and Technology, Boulder, CO, 1989, 0. [all data]

Thermal conductivity

Vesovic, V.; Wakeham, W.A.; Olchowy, G.A.; Sengers, J.V.; Watson, J.T.R.; Millat, J., The transport properties of carbon dioxide, J. Phys. Chem. Ref. Data, 1990, 19, 763-808. [all data]

Auxiliary model

Olchowy, G.A.; Sengers, J.V., A simplified representation for the thermal conductivity of fluids in the critical region, Int. J. Thermophysics, 1989, 10, 417-426. [all data]

Viscosity and auxiliary model

Fenghour, A.; Wakeham, W.A.; Vesovic, V., The Viscosity of Carbon Dioxide, J. Phys. Chem. Ref. Data, 1998, 27, 31-44. [all data]

Surface tension

Rathjen, W.; Straub, J., Temperature dependence of surface tension, coexistence curve, and vapor pressure of CO2, CClF3, CBrF3, and SF6 in Heat Transfer in Boiling, Academic Press, New York, 1977, 425-451. [all data]

Additional Information

Equation of state

At pressures up to 30 MPa and temperatures up to 523 K, the estimated uncertainty ranges from 0.03% to 0.05% in density, 0.03% (in the vapor) to 1% in the speed of sound (0.5% in the liquid) and 0.15% (in the vapor) to 1.5% (in the liquid) in heat capacity. Special interest has been focused on the description of the critical region and the extrapolation behavior of the formulation (to the limits of chemical stability).

Auxiliary model

Use of this Cp0 equation in conjunction with Ely's BWR will produce numbers identical to those calculated in NIST12, Version 3.0.

Thermal conductivity

Note: Vesovic et al. use a crossover equation of state to compute derivatives in the critical region; the default EOS is used here. Also, their "simplified" critical enhancement for thermal conductivity is used.

The uncertainty in thermal conductivity is less than 5%.


The uncertainty in viscosity ranges from 0.3% in the dilute gas near room temperature to 5% at the highest pressures.

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 10) of this database in the future. Information on REFPROP version 10 can be found on theREFPROP web page. REFPROP version 10 includes additional data and features not available from this site.