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Electric constant believed fundamental constant determined only by physical measurement and cannot be calculated. A new theory about the origin and the essence of the electric constant is proposed and mathematical formulation is described. The vacuum is considered to be superfluid and the electric constant is described as a physical property of the “vacuum”.

Hydrodynamics laws are applied to calculate the elasticity and the compressibility of the vacuum to obtain the electric constant value. Thus, electric permittivity is the expression of compressibility of the vacuum which is the capability of the vacuum to permit electric field lines. In conclusion, the electric constant is not a fundamental constant but an observable parameter of the vacuum which depends mainly on the vacuum density. This result could have important consequences in our understanding of the origin of physical forces forward Universal Unified Theory based on one constant only, the density of the vacuum.