Abstract
The essence of mass and its relation to the relativistic energy is considered. It is assumed that the rest energy is equal to the total binding energy of the body and can be found through the energies of fundamental fields associated with the substance of the body. Mass as a measure of inertia is calculated by relativistic energy and relativistic momentum. The conclusion is made that after radiation of energy from a system the mass of the system must not decrease, but increase. The opposite case is heating of bodies by external sources, which must be accompanied by an increase in entropy and decrease in the mass of the bodies. On the basis of strong gravitation the mass defect of atomic nuclei is explained. Conclusions of the general theory of relativity and the covariant theory of gravitation with respect to the mass and energy of gravitational field are opposite – in the general theory of relativity, relativistic energy and mass of a body are reduced by the mass-energy of its own gravitational field, and in the covariant theory of gravitation the mass-energy of the gravitational field increases the relativistic energy and body mass.
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