IEVref: 121-11-03 ID: Language: en Status: Standard Term: electric constant Synonym1: permittivity of vacuum [Preferred] Synonym2: Synonym3: Symbol: ε0 Definition: scalar constant ε0 linking the electric quantities and the mechanical quantities, obtained from the relation $F=\frac{1}{4\pi {\epsilon }_{0}}\cdot \frac{|{Q}_{1}{Q}_{2}|}{{r}^{2}}$ based on the Coulomb 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 Publication date: 1998-08 Source: 705‑03‑01 MOD Replaces: Internal notes: 2015-12-02: o corrected to 0. JGO 2017-06-02: Cleanup - Remove Attached Image 121-11-031.gif 2017-06-02: Cleanup - Remove Attached Image 121-11-032.gif CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: