  By the methods of mathematical statistics we test a qualitative prediction of
the old theory of relativistic hydrodynamics non-viscous liquid which can be
used as a part of the process of hadronization within the modern hydrodynamical
approach for the description of the quark-gluon plasma. Experimental data on
the interaction of protons with the energies of 0.8 TeV with emulsion nuclei
are used. Results do not contradict the formation of relativistic ideal
non-viscous liquid in rare central collisions.
