scalar constant ε0 linking the electric quantities and the mechanical quantities, obtained from the relation
based on Coulomb's law in vacuum, where F is the magnitude of the force between two particles with electric charges Q1 and Q2 respectively, placed at a distance r apart
NOTE 1 – In vacuum, the product of the electric constant and the electric field strength E is equal to the electric flux density D:
D = ε0E
NOTE 2 – The electric constant is related to the magnetic constant μ0 and to the speed of light in vacuum c0 by the relation
ε0μ0c02 = 1
NOTE 3 – The value of the electric constant is exactly equal to
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