IEVref: 121-11-03 ID: Language: en Status: Standard Term: electric constant Synonym1: permittivity of vacuum [Preferred] Synonym2: Synonym3: Symbol: ε0 Definition: scalar constant 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 Coulomb's law in a 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 to entry: In a vacuum, the product of the electric constant ε0 and the electric field strength E is equal to the electric flux density D: D = ε0E Note 2 to entry: The electric constant ε0 is related to the magnetic constant μ0 and to the speed of light in vacuum c0 by the relation ε0μ0c02 = 1. Note 3 to entry: The value of the electric constant ε0 is equal to $8,854\text{ }187\text{ }812\text{ }8\left(13\right)\cdot {10}^{12}\frac{\text{A}\cdot \text{s}}{\text{V}\cdot \text{m}}$ Publication date: 2021-01 Source: Replaces: 121-11-03:1998-08 Internal notes: CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: