WTT User's Guide
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Prediction Methods

In order to complement existing experimental data sets, the ThermoData Engine software, underlying most of the property values given here, implements a series of property estimation techniques. This approach allows for filling of data "gaps", detection of anomalous values from the literature, and a more complete representation of a compound's thermophysical properties.

Property Method Type References
Normal Boiling Point Constantinou-Gani GC 12
  Marrero-Pardillo GC 13
Critical Temperature Modified Joback GC 11
  Constantinou-Gani GC 12
  Marrero-Pardillo GC 13
  Wilson-Jasperson GC 14
  NIST/TRC QSPR method QSPR 25
Critical Pressure Modified Joback GC 11
  Constantinou-Gani GC 12
  Marrero-Pardillo GC 13
  Wilson-Jasperson GC 14
  NIST/TRC QSPR method QSPR 25
Critical Density Modified Joback GC 11
  Constantinou-Gani GC 12
  Marrero-Pardillo GC 13
Density (saturated liquid) Modified Rackett CS 16
  Riedel CS 23, 24
Heat Capacity (ideal gas) Modified Joback CS 11
Heat Capacity (sat'd liquid) Modified Bondi CS 17
2nd Virial Coefficient Xiang CS 18
3nd Virial Coefficient Liu-Xiang CS 22
Vapor Pressure Ambrose-Walton CS 15
Viscosity (gas) Lucas CS 17
Viscosity (sat'd liquid) Sastri-Rao Combined 19
Thermal Conductivity (gas) Chung-1984 CS 20
Thermal Conductivity (sat'd liquid) Chung-1984 CS 21
Intrinsic Entropy (Ideal gas) Benson GC 17
Enthalpy of Formation (Ideal gas) Benson GC 17, NIST/TRC extensions

GC = Group Contribution method
CS = Corresponding States method
QSPR = Quantitative Structure Property Relationship developed at NIST/TRC based on computed 3-dimensional structures


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TDE-SOURCE Archive of Experimental Property Data Uncertainties