Abstract
We report a unified non-fitting formulization representation of the Gibbs free energy for diatomic substances. The present correlation with temperature and pressure as independent variables is significantly dependent on experimental data of four molecular constants. To prove the availability of the developed model, we apply it to predict Gibbs free energy and isobaric heat capacity values for 36 diatomic substances in broad temperature ranges. The average absolute deviations (AADs) between the predicted Gibbs free energy values and the National Institute of Standards and Technology (NIST) data are within 0.0145% and 0.1994% for the collected 36 substances. The AADs between the isobaric heat capacity values and the NIST data are within 0.7216% and 6.7765% for 36 substances.
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