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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 ε_{0} 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 the Coulomb law in vacuum, where NOTE 1 – In vacuum, the product of the electric constant and the electric field strength :D
ε_{0}ENOTE 2 – The electric constant is related to the magnetic constant
NOTE 3 – The value of the electric constant is exactly equal to
$\frac{{10}^{7}}{4\pi \times 299\text{}792{\text{}458}^{2}}{\text{m}}^{-\text{\hspace{0.05em}}3}{\text{kg}}^{-\text{\hspace{0.05em}}1}{\text{s}}^{4}{\text{A}}^{2}=8,854\text{}187\text{}817\dots \text{}\text{pF}/\text{m}$ | ||

Publication date: | 1998-08 | ||

Source: | 705‑03‑01 MOD | ||

Replaces: | |||

Internal notes: | 2015-12-02: <sub>o</sub> corrected to <sub>0</sub>. 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: | |||

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Domain5: |

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

based on the Coulomb law in 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
*E* is equal to the electric flux density ** D**:

** D** =

*ε*_{0}*μ*_{0}*c*_{0}^{2} = 1