Abstract
It is shown that, if one assumes Dirac's electrodynamics to be the correct description of the electromagnetic field at the absolute zero of temperature, the electromagnetic vacuum ("the Dirac sea") can be considered as a nonviscous fluid, in which pressure waves ("sound") travel with velocity c, and in which with rising temperature excitations appear as particles analogous to the excitations ("phonons" and "rotons") in ordinary nonviscous fluids at low temperatures. It is suggested that photons be considered as vortex-free excitations and charged particles as vortex excitations of the fluid representing the electromagnetic vacuum. Some evidence which supports this suggestion is given.

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