**METHANE**

METHANE provides thermodynamic properties using the fundamental equation of state developed by U. Setzmann and W. Wagner, "*A New Equation of State and Tables of Thermodynamic Properties for Methane Covering the Range from the Melting Line to 625 K at Pressures up to 1000 MPa*", J. Phys. Chem. Ref. Data, Vol. 20, No. 6, 1991.

The values of specific enthalpy and entropy are by default referred to -0.9889 kJ/kg and -0.002289 kJ/kg-K, respectively at 298.15 K and 101.3 kPa. The reference state can be changed using the $Reference directive.

Transport properties are from B.A. Younglove and J.F. Ely,* "Thermophysical Properties of Fluids. II Methane, Ethane, Propane, Isobutane and Normal Butane"*, J. Phys. Chem. Ref. Data Vol. 16, No. 4, 1987.

__Range of applicability for equation of state and transport functions:__

90.7 K < T < 625 K

0 < P < 1000 MPa

__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

Note that METHANE provides thermodynamic properties assuming real fluid behavior. Use CH4 for ideal gas properties of methane consistent with reference states used in combustion calculations.