# Nitrogen¶

## References¶

### Equation of State¶

Roland Span, Eric W. Lemmon, Richard T. Jacobsen, Wolfgang Wagner, and Akimichi Yokozeki. A Reference Equation of State for the Thermodynamic Properties of Nitrogen for Temperatures from 63.151 to 1000 K and Pressures to 2200 MPa. J. Phys. Chem. Ref. Data, 29:1361–1433, 2000. doi:10.1063/1.1349047.

### 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.

### Melting Line¶

Roland Span, Eric W. Lemmon, Richard T. Jacobsen, Wolfgang Wagner, and Akimichi Yokozeki. A Reference Equation of State for the Thermodynamic Properties of Nitrogen for Temperatures from 63.151 to 1000 K and Pressures to 2200 MPa. J. Phys. Chem. Ref. Data, 29:1361–1433, 2000. doi:10.1063/1.1349047.

### Surface Tension¶

A. Mulero, I. Cachadiña, and M. I. Parra. Recommended Correlations for the Surface Tension of Common Fluids. J. Phys. Chem. Ref. Data, 41(4):043105–1:13, 2012. doi:10.1063/1.4768782.

## Aliases¶

nitrogen, NITROGEN, N2, R728

## Fluid Information¶

Parameter, Value
General
Molar mass [kg/mol] 0.02801348
CAS number 7727-37-9
ASHRAE class A1
Formula $$N_{2}$$
Acentric factor 0.0372
InChI InChI=1/N2/c1-2
InChIKey IJGRMHOSHXDMSA-UHFFFAOYAF
SMILES N#N
ChemSpider ID 922
2D image
Limits
Maximum temperature [K] 2000.0
Maximum pressure [Pa] 2200000000.0
Triple point
Triple point temperature [K] 63.151
Triple point pressure [Pa] 12519.7834843
Critical point
Critical point temperature [K] 126.192
Critical point density [kg/m3] 313.3
Critical point density [mol/m3] 11183.9014646
Critical point pressure [Pa] 3395800.0

## 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.