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NIST Standard Reference Database 88

NIST/TRC Ideal Gas Database

The NIST TRC Ideal Gas Database (TRCIDG) provides information on the most important thermodynamic properties (heat capacities, entropies, enthalpies, Gibbs free energies and enthalpies and Gibbs free energies of formation) of organic and some other compounds in the ideal gas state. There is a total of more than 2000 compounds. The heat capacities are calculated using coefficients of linear or non-linear functions of their temperature dependence. These coefficients were obtained based on the results of statistical mechanical or additive calculations.

The other properties (entropies, enthalpies and Gibbs free energies) are determined by integration using a heat capacity function. The enthalpies and Gibbs free energies of formation are calculated based on the properties of the individual compounds and the properties of their elements in the standard states. The calculations can be performed in two different regimes: non-linear and polynomial. The polynomial regime uses a linear function to represent temperature dependence of heat capacity. In the non-linear regime, heat capacities are calculated using a non-linear function of temperature. This ensures accuracy over a wide temperature range.

System Requirements: PC with Microsoft^® Windows^® 95, 98, NT, 2000; hard disk with 110MB of available space.

Cost: $240.00.

88. NIST/TRC Ideal Gas Database

For more information please contact:

The scientific contact for the database is:

Key words: heat capacity: thermodynamic; entropy; enthalpy; Gibbs free energy; Gibbs free energy of formation; gases