1.14.55: Process
In order to document the thermodynamics of processes a convention has been agreed. In general, the thermodynamic variable takes the following form.
\[\Delta_{\text {proc }} \mathrm{X}^{0} \nonumber \]
Here
- \(\Delta\) signals a change is the thermodynamic extensive variable \(\mathrm{X}\);
-
the subscript ‘proc’ signals the process; e.g.
- \(\mathrm{f} =\) formation
- \(\mathrm{c} =\) combustion
- \(\mathrm{vap} =\) vaporisation
- \(\mathrm{r} =\) chemical reaction
- \(\mathrm{aln} =\) = solution
In recognition of the long tradition of using a ‘double-dagger’, a superscript \(\neq\) indicates activation as in the formation of ‘transition state from reactants.
-
the superscript ‘0’ means under standard conditions which should be defined. Example.
- \(\Delta_{\mathrm{c}} \mathrm{H}^{0}=\) standard enthalpy of combustion
- \(\Delta^{\neq} \mathrm{V}^{0}=\) standard volume of activation