Contents - Index



NITROGEN provides thermodynamic properties using the fundamental equation of state reported by:


Span, R., Lemmon, E.W,, Jacobsen, R.T., Wagner, W., and Yokozeki, A.,

"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, Vol. 29, No. 6, 2000 


The reference state for specific enthalpy and entropy are 0 at 0 K and 101.325 kPa for the ideal gas state.  The reference state can be changed using the $Reference directive.


Note that NITROGEN provides thermodynamic properties assuming real fluid behavior.  Use N2 for ideal gas properties of nitrogen consistent with reference states used in combustion calculations.  


The transport properties are implemented with the equations provided in:

E.W. Lemmon and R.T. Jacobsen

"Viscosity and Thermal Conductivity Equations for Nitrogen, Oxygen, Argon, and Air"

International Journal of Thermophysics, Vol. 25, No. 1, January 2004, pp. 21-69


Surface tension data are provided using the information in:

Mulero, A., Cachadina, I, and Parra, M.

"Recommended Correlations for the Surface Tension of Common Fluids"

J.Phys. Chem Ref. Data, Vol. 41, No.4, 2012


The melting pressure curve (valid for temperatures between 63.15 K and 191 K) is determined from:

Span, R., Lemmon, E.W,, Jacobsen, R.T., Wagner, W., and Yokozeki, A., (referenced above)


The sublimation pressure curve (valid for temperatures between 20 K and 63.15) is determined from:

N.Fray, B.Schmitt, 

"Sublimation of ices of astrophysical interest:A bibliographic review" 

Planetary and Space Science,57, (2009)  pp. 2053-208

(Note that solid nitrogen exists in two crystalline structures with a phase change occurring at 35.7 K.)



Fluid Property Information