Contents - Index



N-PENTANE provides high accuracy thermodynamic properties for normal pentane (Molar mass =72.147 g/mole) using the Fundamental Equation of State, as described by: 


R.T. Jacobsen, S.G. Penoncello and E.W. Lemmon

Thermodynamic Properties of Cryogenic Fluids

Plenum Press, ISBN 0-306-45522-6, 1997


The equation of state is based upon the formulation developed by:

Span, R.,

"Multiparameter Equations of State - An Accurate Source of Thermodynamic of Property Data," Springer, Berlin, Heidelberg, New York, (2000).  The parameters needed for this formulation were provided by Eric Lemmon at NIST, Boulder Co.


The specific heat of n-pentane in the ideal gas state is determined from

Jaeschke, M. and Schley, P.

"Ideal-Gas Thermodynamic Properties for Natural-Gas Applications"

Intl. Journal of Thermophysics, Vol. 16, No. 6, pp. 1381-1385, (1995)


Reference State 

    h = 0 kJ/kg, s = 0 kJ/kg-K at 298.15 K, 101.325 kPa.  The reference state can be changed using the $Reference directive.


Range of applicability for equation of state:

   177 K < T <  589 K

0 < P < 55 MPa


Thermal Conductivity and viscosity correlations were fit to tabular data provided in:

"Properties of Inorganic and Organic Fluids"

Edited by C.Y. Ho

Authored by: P.E. Liley, T. Makita, and Y. Tanaka.

CINDAS Data Series of Material Properties, Vol V-1

Hemisphere Publishing Corporation

Chapter 26 - n-Pentane


Range of applicability for transport function correlations:

Gas-phase viscosity:  290 K to 589 K

Liquid-phase viscosity: 177K to 470 K

Gas-phase thermal conductivity: 290 K to 589K

Liquid-phase thermal conductivity: 177K to 470 K


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



Fluid Property Information