Vacuum permittivity

The vacuum permittivity or permittivity of free space ε0\varepsilon_{0} is a dimensional constant that binds the electric charge to mechanical quantities like force. In SI units it is

ε0=8.854×10−12 F/m\varepsilon_{0}=8.854\times10^{-12}\text{ F}/\text{m}

It is related to the Vacuum permeability and the Speed of light by

c=1ε0μ0c=\frac{1}{\sqrt{ \varepsilon_{0}\mu_{0} }}