**PROPANE or R290**

PROPANE provides high accuracy thermodynamic and transport properties for propane (C3H8, Molar mass = 44.095 g/mol) using the Fundamental (or Helmholtz Free Energy) Equation of State formulated by:

Miyamoto, H., and Watanabe, K.,

"A thermodynamic property model for fluid-phase propane,"

Int. J. Thermophys., 21(5):1045-1072, 2000.

The equation of state is valid for temperatures between 85.48 K (the triple point temperature) and 623 K at pressures up to 103 MPa. The default reference state is the IIR standard for which h=200.0 kJ/kg and s=1.0 kJ/kg-K for saturated liquid at 273.15 K. The reference state can be changed using the $Reference directive.

Note that PROPANE provides thermodynamic properties assuming real fluid behavior. Use C3H8 for ideal gas properties of propane consistent with reference states used in combustion calculations.

__Thermal conductivity data are provided by:__

K.N. Marsh, R.A. Perkins, M.L.V. Ramires,

"Measurement and correlation of the thermal conductivity of propane from 86 K to 600 K at pressures to 70 MPa,"

*J. Chem. Eng. Data* **47**, 932-940 (2002)

__Viscosity data are provided by:__

Eckhard Vogel and Sebastian Herrmann

"New Formulation for the Viscosity of Propane"

*J. Phys. Chem. Ref. Data* 45, 043103 (2016);

https://doi.org/10.1063/1.4966928

This correlation replaced the viscosity correlation by B.A. Younglove and J.F. Ely, *J. Phys. Chem. Ref. Data Vol. 16, No. 4, 1987* in version 11.595.

__Surface tension data are provided through a correlation developed by:__

G.R. Somayajulu

"A Generalized Equation for Surface Tension from the Triple Point to the Critical Point"

International Journal of Thermophysics, Vol. 9, No. 4, 1988

__The melting pressure curve (valid for temperatures between 85.48 K and 168 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