Updating of the classic MHD equations by using of full set of Maxwell equation with displacement
current gave a possibility to describe hydrodynamic phenomena, together with electromagnetic
ones by the same set of equations. These equations applied for study of propagation of different
waves and of transformation between different kind of waves in the nonuniform media.
Dispersion equation is derived describing a propagation of a linear wave in a uniform magnetized
plasma. It contains MHD, HD, Alfven and EM waves in the limiting cases, and some new types
of behaviour in a general situation. It is shown, that transformation of MHD into EM wave may
happen only in a highly magnetized plasma. The regions of parameters are found, where no waves
exist, and only damping static perturbations may be present.