## Wikipedia - Costante dielettrica del vuoto permittivity of vacuum

https://doi.org/10.1351/goldbook.P04508
Fundamental physical constant $$\varepsilon_{0}=\frac{1}{\mu _{0}\ c_{0}^{2}}$$ exactly, where $$\mu_{0}$$ is the @P04504@ and $$c_{0}$$ the speed of light in vacuum. It is equal to $$8.854\ 187\ 817\,...\times\ 10^{-12}\ \text{F m}^{-1}$$.
Sources:
CODATA 2006 [Terms] [Book]
Green Book, 2nd ed., p. 14 [Terms] [Book]