This page explains the format for data used at this web site. Thermodynamic equations used are:


format 


Species name or formula Comments and data source 
A62 
19 to 80 

Number of T intervals Reference data code Chemical formula—symbols (all capitals) and numbers Zero for gas; nonzero for condensed^{a} Molecular weight Heat of formation at 298.15 K, J/mol 
A6 5(A2, F6.2) I2 F13.7 F15.5 
4 to 9 11 to 50 51 to 52 53 to 65 66 to 80 

Temperature range Number of coefficients for (always seven) T exponents in empirical equation for [always –2, –1, 0, 1, 2, 3, 4; see eq. (1)] H^{o}(298.15) – H^{o}(0) J/mol, if available 
I1 8F5.1 F15.3 
23 24 to 63 66 to 80 

First five coefficients for , eq. (1) 



Last two coefficients for , eq.
(1) Integration constants b_{1} and b_{2}, eqs. (2) and (3) 
2D16.9 
49 to 80 

Repeat 3, 4, and 5 for each interval 


For example, the following data are for condensed titanium nitride:
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