**OXYGEN**

OXYGEN provides thermodynamic properties using the Fundamental equation of state developed by R.B. Stewart, R.T. Jacobsen, and W. Wagner, *"Thermodynamic Properties of Oxygen from the Triple Point to 300 K with Pressures to 80 MPa"*, J. Phys, Chem, Ref. Data, Vol. 20, No. 5, 1991.

Note that OXYGEN provides thermodynamic properties assuming real fluid behavior. The reference state for *ideal gas* specific enthalpy and entropy is 0 kJ/kmol and 0 kJ/kmol-K respectively at 298.15 K and 101.325 kPa.

The upper limit on the temperature range of applicability has been set to 2000 K, which is much beyond the 300 K in the publication. Tests from NIST (communicated by Eric Lemmon) indicate that the equation of state can be accurately applied at higher temperatures.

Use O2 for ideal gas properties of oxygen consistent with reference states used in combustion calculations.

**Transport Properties**:

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 54.361 K and 83 K) is determined from:__

Lide, D.R. and Kehiaian, H.V.,

**CRC Handbook of Thermophysical and Thermochemical Data**

CRC Press, 1994, ISBN 0-8493-0197-1, 5th printing

__The sublimation pressure curve (valid for temperatures between 23.781 K and 54.36) 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 oxygen exists in three crystalline structures with phase changes occurring at 23.781 K and 43.772 K. Sublimation data for temperatures below 23.781 K are not included.)