  From the equations of conservation laws for energy, linear momentum, angular
momentum and mass the evolutionary relation in differential forms follows. This
relation connects the differential of entropy and the skew-symmetric form,
whose coefficients depend on the characteristics of gas-dynamic system and the
external actions.
  The evolutionary relation turns out to be nonidentical that is explained by
the noncommutativity of conservation laws.
  The properties of such nonidentical relation (selfvariation, degenerate
transformation) enable one to disclose the mechanism of evolutionary processes
in gas-dynamic system that are accompanied by origination of vorticity and
turbulence. In this case the intensity of vorticity and turbulence is defined
by the commutator on unclosed skew-symmetric form in the nonidentical
evolutionary relation.
