H2O
H2O provides ideal gas thermodynamic properties for gaseous water valid over the temperature range from 50 K to 6000 K based on the property information provided by McBride et al. (2002) (200 K to 6000 K) and Hilsenrath et al. (1955) (50 K to 200 K). The reference state for specific enthalpy is based on the enthalpy of formation relative to the elements at 25 C. The reference state for specific entropy is based on the Third Law of Thermodynamics. The reference values are from:
Bonnie J. McBride, Michael J. Zehe, and Sanford Gordon
"NASA Glenn Coefficients for Calculating Thermodynamic Properties of Individual Species"
NASA/TP-2002-211556, Sept. 2002
https://www.grc.nasa.gov/WWW/CEAWeb/
Joseph Hilsenrath, Charles W. Beckett, William S. Benedict, Lilla Fano, Harold J. Hoge, Joseph F. Masi, Ralph L. Nuttall, Yeram S. Touloukian, and Harold W. Woodley
"Tables of Thermal Properties of Gases"
National Bureau of Standards Circular 564
issued November 1, 1955
Transport property correlations are implemented for temperatures between 245 K and 3500 K.
Note that H2O provides thermodynamic properties assuming ideal gas behavior. Use STEAM or WATER to provide real fluid properties in the subcooled, saturated mixture, and superheated regimes. High accuracy steam properties are available with substance STEAM_IAPWS.