Bodenstein pseudo steady state approximation

Applying the Bodenstein pseudo-steady-state approximation, where it is assumed that the excited molecule M is formed as quickly as it disappears, yields... 

Thus for a homogeneous system operating at constant volume, the pseudo-steady mode gives the same result as the Bodenstein quasi-steady state approximation. We can say that we have a quasi-steady state mode. 

There may be situations where the rates of the individual steps are all of the same order of magnitude and we could not invoke the pseudoequilibrium hypothesis. In such a case, we can use the pseudo-steady-state hypothesis, or Bodenstein (1927) approximation At some point during the reaction, the rate of formation and the rate of disappearance of an intermediate are identical causing a steady-state concentration, or surface coverage, of the reactive intermediate. 

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See also in sourсe #XX -- [ ]

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