# Air¶

## References¶

### Equation of State¶

Eric W. Lemmon, Richard T. Jacobsen, Steven G. Penoncello, and Daniel G. Friend. Thermodynamic Properties of Air and Mixtures of Nitrogen, Argon, and Oxygen from 60 to 2000 K at Pressures to 2000 MPa. J. Phys. Chem. Ref. Data, 29(3):331–385, 2000. doi:10.1063/1.1285884.

### Thermal Conductivity¶

E. W. Lemmon and R. T Jacobsen. Viscosity and Thermal Conductivity Equations for Nitrogen, Oxygen, Argon, and Air. Int. J. Thermophys., 25(1):21–69, 2004. doi:10.1023/B:IJOT.0000022327.04529.f3.

### Viscosity¶

E. W. Lemmon and R. T Jacobsen. Viscosity and Thermal Conductivity Equations for Nitrogen, Oxygen, Argon, and Air. Int. J. Thermophys., 25(1):21–69, 2004. doi:10.1023/B:IJOT.0000022327.04529.f3.

## Aliases¶

air, AIR, R729

## Fluid Information¶

Parameter, Value
General
Molar mass [kg/mol] 0.02896546
CAS number AIR.PPF
ASHRAE class UNKNOWN
Formula $$N/A$$
Acentric factor 0.0335
InChI N/A
InChIKey N/A
SMILES N/A
ChemSpider ID -1
2D image
Limits
Maximum temperature [K] 2000.0
Maximum pressure [Pa] 2000000000.0
Triple point
Triple point temperature [K] 59.75
Triple point pressure [Pa] 5264.18106877
Critical point
Critical point temperature [K] 132.5306
Critical point density [kg/m3] 342.684564168
Critical point density [mol/m3] 11830.8
Critical point pressure [Pa] 3786000.0
Reducing point
Reducing point temperature [K] 132.6312
Reducing point density [mol/m3] 10447.7

## REFPROP Validation Data¶

Note

This figure compares the results generated from CoolProp and those generated from REFPROP. They are all results obtained in the form $$Y(T,\rho)$$, where $$Y$$ is the parameter of interest and which for all EOS is a direct evaluation of the EOS

You can download the script that generated the following figure here: (link to script), right-click the link and then save as... or the equivalent in your browser. You can also download this figure as a PDF.

## Consistency Plots¶

The following figure shows all the flash routines that are available for this fluid. A red + is a failure of the flash routine, a black dot is a success. Hopefully you will only see black dots. The red curve is the maximum temperature curve, and the blue curve is the melting line if one is available for the fluid.

In this figure, we start off with a state point given by T,P and then we calculate each of the other possible output pairs in turn, and then try to re-calculate T,P from the new input pair. If we don’t arrive back at the original T,P values, there is a problem in the flash routine in CoolProp. For more information on how these figures were generated, see CoolProp.Plots.ConsistencyPlots

Note

You can download the script that generated the following figure here: (link to script), right-click the link and then save as... or the equivalent in your browser. You can also download this figure as a PDF.