## rate of conversion, $$\dot{\xi}$$

https://doi.org/10.1351/goldbook.R05147
The rate of conversion for a reaction occurring in a closed system is defined as the time derivative of the @E02283@: $\overset{\text{.}}{\xi }=\frac{\mathrm{d}\xi }{\mathrm{d}t}$ In view of the definition of @E02283@ it follows that with reference to any species in a reaction showing time-independent @S06026@ $\overset{\text{.}}{\xi }=\frac{\mathrm{d}\xi }{\mathrm{d}t}=\frac{1}{\nu _{i}}\ \frac{\mathrm{d}n_{i}}{\mathrm{d}t}$ where $$n_{i}$$ is the amount of the species at any time and $$\nu _{i}$$ is its @S06021@ @C01124@.
Sources:
Green Book, 2nd ed., p. 55 [Terms] [Book]
PAC, 1992, 64, 1569. (Quantities and units for metabolic processes as a function of time (IUPAC Recommendations 1992)) on page 1573 [Terms] [Paper]
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 180 [Terms] [Paper]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 989 [Terms] [Paper]