[en] The properties of a degenerate superdense plasma are considered. It is shown that when the density of a degenerate substance rho>3.4x10¹⁰ g/cm³ the neutronization effect must be replaced by pionization. As the density increases, the relative number of negative pions in nuclei monotonously increases, while neutron and proton concentrations are freezed at 0.6 and 0.4. At density of 6x10¹¹ g/cm³ and pressure of 6.6x10²⁹ erg/cm³ a phase transformation into the continuous nuclear matter state occurs. In this phase the numbers of neutrons, protons and pions are: 0.591N, 0.409N; 0.406N respectively, where N is the number of nucleons, and the state resembles the liquid state: the substance is in a bound state (nucleon chemical potentials are negative) and is incompressible up to pressures of about 5x10³³ erg/cm³. Adronic plasma is qualitatively considered at density above the nuclear one. The equation of degenerate plasma state covering the entire density range has been obtained