IEVref: | 121-11-03 | ID: | |

Language: | en | Status: Standard | |

Term: | electric constant | ||

Synonym1: | permittivity of vacuum [Preferred] | ||

Synonym2: | |||

Synonym3: | |||

Symbol: | ε_{0}
| ||

Definition: | scalar constant linking the electric quantities and the mechanical quantities, obtained from the relation
$F=\frac{1}{4\pi {\epsilon}_{0}}\cdot \frac{\left|{Q}_{1}{Q}_{2}\right|}{{r}^{2}}$
based on Coulomb's law in a vacuum, where Note 1 to entry: In a vacuum, the product of the electric constant :
D
ε_{0}ENote 2 to entry: The electric constant Note 3 to entry: The value of the electric constant
$\mathrm{8,854}\text{\hspace{0.17em}}187\text{\hspace{0.17em}}812\text{\hspace{0.17em}}8(13)\cdot {10}^{-12}\frac{\text{A}\cdot \text{s}}{\text{V}\cdot \text{m}}$ | ||

Publication date: | 2021-01 | ||

Source | |||

Replaces: | 121-11-03:1998-08 | ||

Internal notes: | 2022-01-18: Note 3 to entry, correction of equation to add "minus" before the superscript "12". JGO | ||

CO remarks: | |||

TC/SC remarks: | |||

VT remarks: | |||

Domain1: | |||

Domain2: | |||

Domain3: | |||

Domain4: | |||

Domain5: |

$F=\frac{1}{4\pi {\epsilon}_{0}}\cdot \frac{\left|{Q}_{1}{Q}_{2}\right|}{{r}^{2}}$

based on Coulomb's law in a vacuum, where *F* is the magnitude of the force between two particles with electric charges *Q*_{1} and *Q*_{2} respectively, placed at a distance *r* apart

Note 1 to entry: In a vacuum, the product of the electric constant *ε*_{0} and the electric field strength ** E** is equal to the electric flux density

** D** =

Note 2 to entry: The electric constant *ε*_{0} is related to the magnetic constant *μ*_{0} and to the speed of light in vacuum *c*_{0} by the relation
*ε*_{0}*μ*_{0}*c*_{0}^{2} = 1.

Note 3 to entry: The value of the electric constant *ε*_{0} is equal to

$\mathrm{8,854}\text{\hspace{0.17em}}187\text{\hspace{0.17em}}812\text{\hspace{0.17em}}8(13)\cdot {10}^{-12}\frac{\text{A}\cdot \text{s}}{\text{V}\cdot \text{m}}$