A priori simplification of the primary mechanism

The exhaustiveness of the mechanism has an obvious drawback, i.e. the large number of species and of reactions. The application of the kinetic laws Bp given in Chapter VIII allows the size of the mechanism to be reduced a priori by inactivating certain generic reactions. 

When the temperature is high enough, which is the case of flames, the p and Bp radicals easily decompose by beta-scission reactions, so that their concentrations become negligible with respect to those of the B radicals. 

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