The permittivity of free space or vacuum permittivity, represented by ε0, is a constant representing the relationship between electric charge and force. It is equal to (farads per metre) where µ0 is the permeability of free space. It is most commonly seen in Coulomb's law and Maxwell's equations. File:Plasma globe.jpg This electromagnetism-related article contains minimal information concerning its topic. You can help the Physics Wiki by adding to it.