Contents - Index



AMMONIA provides thermodynamic properties for ammonia using the fundamental equation of state developed by Tillner-Roth, Harms-Watzenberg, and Baehr, "Eine neue Fundamentalgleichung fur Ammoniak", DKV-Tagungsbericht 20:167-181, 1993.


The default values of specific enthalpy and entropy are referred to 200 kJ/kg and 1.00 kJ/kg-K, respectively for the state of saturated liquid at 273.15 K.  The reference state can be changed using the $Reference directive.


Viscosity is provided using the representation of:

S. A. Monogenidou1, M. J. Assael1, and M. L. Huber,

"Reference Correlation for the Viscosity of Ammonia from the Triple Point to 725 K and up to 50 MPa"

J Phys Chem Ref Data. 2018 ; 47: 


Critical point enhancement is not implemented. 

(Versions prior to 11.596 used the correlation of Fenghour, A., et al,  J. Phys. Chem. Ref. Data, Vol. 24, No., 5, 1995.)


Thermal conductivity information is based on the correlation of:

S. A. Monogenidou,S.A.,Assael,M. J. and Huber,M.L.,

"Reference Correlation for the Thermal Conductivity of Ammonia from the Triple-Point Temperature to 680 K and Pressures up to 80 MPa"

J. Phys. Chem. Ref. Data 47, 043101 (2018)

Critical point enhancement is included. 

(Versions prior to 11.596 used the correlation of Tufeu, R., et al.,  Ber. Bunsenges. Phys. Chem., 88:422-427, 1984.


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


The sublimation pressure curve (valid for temperatures between 30 K and 195,495 is determined from:

N.Fray, B.Schmitt, 

"Sublimation of ices of astrophysical interest:A bibliographic review" 

Planetary and Space Science,57, (2009)  pp. 2053-2080


The melting pressure curve (valid for temperatures between 195.495 K and 217.1 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


Fluid Property Information