1.14.55: Process
- Page ID
- 390571
\( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\)
In order to document the thermodynamics of processes a convention has been agreed. In general, the thermodynamic variable takes the following form.
\[\Delta_{\text {proc }} \mathrm{X}^{0}\]
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