  The nucleation rate derived in the classical theory contains at least one
undetermined parameter, which may be expressed in terms of the Langer
first-principles theory. But the uncertainties in the accounting for
fluctuation modes, which are either absorbed into the free energy of a critical
cluster or not, result in different evaluations of the statistical prefactor
and nucleation rate. We get the scaling approximations of the nucleation rate
for the vapour condensation both near and out of the critical range. The
results obtained deserve the experimental verification to resolve the
theoretical uncertainty. PACS numbers: 64.60.Qb, 05.70.Fh, 64.60.Fr, 64.70.Fx
