  This work considers the seven-coefficient polynomials proposed by the
National Aeronautics and Space Administration (NASA) to facilitate obtaining a
normalized value for three thermodynamic standard-state specific properties of
ideal gases or condenser matters over an interval of temperature. These
properties are the heat capacity at constant pressure, the absolute enthalpy
(sensible enthalpy plus heat contents due to chemical or physical changes), and
the entropy. In the open literature, one can find several databases for the
polynomial coefficients with variation in the number of species included or the
range of temperature covered, and this raises a question of whether the choice
of a database to use has an important impact on these evaluated thermodynamic
properties. Addressing this point, we compare and assess three databases for
the NASA 7-coefficient polynomials, over a selected range of temperature from
300 K to 3500 K, and for selected six common gaseous species encountered in
combustion or industrial processes, which are molecular oxygen (O2), molecular
nitrogen (N2), molecular hydrogen (H2), methane (CH4), carbon dioxide (CO2),
and water vapor (H2O). Our comparisons suggest that despite the difference in
the values of coefficients, there is no significant difference in their
predictions. However, the latest (7th edition) database of Prof. Alexander
Burcat hosted at E\"otv\"os Lor\'and University (ELTE) in Budapest, Hungary
showed superior features when contrasted to other two databases (one
accompanying the simulation package OpenFOAM 6, and another provided by the
natural-gas reaction mechanism GRI-MECH 3.0).
