formula.expert

Constants library

2 values, each with its units, its uncertainty, and where it came from.

Electromagnetic 2

Vacuum electric permittivity measured

ε0=8.8541878188×10−12 F/m\varepsilon_{0} = 8.8541878188 \times 10^{-12}\ \text{F/m}

F/mThe electric constant of free space, setting the strength of Coulomb's law and the capacitance of every parallel-plate geometry.

Coulomb constant measured

ke=8987551786.2 N⋅m2/C2k_{e} = 8987551786.2\ \text{N}{\cdot}\text{m}^{2}\text{/C}^{2}

N·m²/C²The proportionality constant 1/(4πε₀) in Coulomb's law, fixing the enormous strength of the electrostatic force between charges.