Contents - Index



PARAHYDROGEN provides high accuracy thermodynamic properties for parahydrogen (Molar mass =2.01594 kg/kmol) using the Fundamental Equation of State, as described by: 


Fundamental Equations of State for Parahydrogen, Normal Hydrogen, and Orthohydrogen

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

J. Phys. Chem. Ref. Data 38, 721 (2009)


Reference State 

    h = 4426 kJ/kg, s = 56.70 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:

   13.8 < T < 1000 K

0 < P < 2000 MPa


Viscosity data are provided from:

Measurements of the Viscosity of Parahydrogen

Dwain E. Diller

J. Chem. Phys. 42, 2089 (1965); doi:10.1063/1.1696250

Issue Date: 15 March 1965 


Conductivity for low pressure gaseous and saturated liquid parahydrogen is based on data from:

Vargaftik, N.B., Filippov, L.P, Tarzimanov, A.A., and Totskii, E.E.,

Handbook of Thermal Conductivity of Liquids and Gases 

CRC Press, 1994, ISBN 0-8493-9345-0


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



Fluid Property Information