“…In the presence of impurities, which, as a rule, increase the natural conductivity of a cleared fluid σ 0 , for the calculation of u a , i , it is necessary to take into account their characteristics influenc- ing thermal ionization (thermal dissociation). 1 For application of this statistical kinetics with the covalent atom B affinity to the electron u e , along with the use of a formulae close to equations (1), which is widely applied in statistical physics (mechanics), a sufficiently known hypothesis for linear dependence of the volume rate of ion formation W D, I = W D , I ( n a , n p ) on the neutral molecule concentration n a is postulated. In addition, its monotonously increasing dependence on module E (which is restricted by the breakdown voltage module being sufficiently high for the fluids under study), as well as on the relatively low volume concentration of the possibly available impurities n p , is taken into account.…”