  Linear waves are investigated in a rotating gas under the condition of strong
centrifugal acceleration of the order $10^6 g$ realized in gas centrifuges for
separation of uranium isotopes. Sound waves splits into three families of the
waves under these conditions. Dispersion equations are obtained. The
characteristics of the waves strongly differ from the conventional sound waves
on polarisation, velocity of propagation and distribution of energy of the
waves in space for two families having frequencies above and below the
frequency of the conventional sound waves. The energy of these waves is
localized in rarefied region of the gas. The waves of the third family were not
specified before. They propagate exactly along the rotational axis with the
conventional sound velocity. These waves are polarized only along the
rotational axis. Radial and azimuthal motions are not excited. Energy of the
waves is concentrated near the wall of the rotor where the density of the gas
is largest.
