**SULFURHEXAFLUORIDE**

SulfurHexafluoride (SF6) provides high accuracy thermodynamic properties for sulfur hexafluoride (Molar mass =146.054 g/mole) using the Fundamental Equation of State, as described by:

Span, R. and Wagner, W.

"Equations of State for Technical Applications: II Results for Non-Polar Fluids"

Int. J. of Thermophysics, Vol. 24, No. 1, Jan. 2003

The specific heat of sulfur hexafluoride in the ideal gas state uses the equation given by:

Cole, W.A. and de Reuck, K.M.

An Interim Analytic Equation of State for Sulfurhexafluoride

International Journal of Thermophysics, Vol. 11, 1990, pp. 189-199

**Reference State **

** ** h = 0 kJ/kg, s = 0 kJ/kg-K at 273.15 K, 101.325 kPa. The reference state can be changed using the $Reference directive.

**Range of applicability for equation of state**:

222.38 K < T < 750 K

0 < P < 60 MPa

__Thermal conductivity correlations were fit to tabular data provided in:__

*"Handbook of Physical Properties of Liquids and Gases"*

Natan B. Vargaftik, Yurii K. Vinogradov, and Vadim S. Yargin

3rd Augmented and Revised Edition

Begell House, Inc

__Gas-phase viscosity is from:__

*"Recommended Values for the Viscosity in the Limit of Zero Density and its Initial Density Dependence for Twelve Gases and Vapors: Revisited from Experiment*

*between 297 K and 691 K"*

Eckhard Vogel

J. Phys. Chem. Ref. Data 49, 043102 (2020); https://doi.org/10.1063/5.0023688

__Range of applicability for transport function correlations:__

Gas-phase viscosity: 222 K to 750K

Liquid-phase viscosity: 222 K to 318.7 K

Gas-phase thermal conductivity: 220 K to 750 K

Liquid-phase thermal conductivity: 222 K to 318.7 K

__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