In the present paper, there will be determined, in the framework of the macroscopic Electrodynamics, the dynamic properties of the electromagnetic field in the proper sense in bodies, a component of the physical system substance-field, as well as the dynamic properties of the system substance-field. For the proofs, only the general Maxwell equations and the relationships of inductions, strengths and polarizations will be used. There is also shown that the Maxwell equations expressed in terms of the state quantities of the field {E, B}, to which the four state quantities of the electromagnetic state of the substance have to be added, namely {ρ, J, P, M}, permit the dynamic characterization of the components of the substance-field system, like in the microscopic Electrodynamics of Lorentz.

Keywords: Energy, Dynamic properties of the electromagnetic field.