Volume number of particles and

We begin with the microstate probability i(i —> j) of making a move from configuration i to j, each characterized by a volume, number of particles, and set of coordinates q. This probability and its reverse satisfy the detailed balance condition ... 

There are other ways to define ensembles. For example, a microcanonical ensemble is defined as a set of microstates in which the volume, number of particles, and energies of each microstate are the same. So although equations 17.4 and 17.5 are still valid for a microcanonical ensemble, equation 17.6 is not. Rather, for a microcanonical ensemble we have... 

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