KnowraVacuum permittivityLinked fromLinked fromThe 20 pages that link to Vacuum permittivity, each with the reason it gives.All 20Broader topic 3Related 15Compared with 2PermittivityBroader topic: It provides the reference value used to define relative permittivity.Coulomb potentialBroader topic: In vacuum, it determines the constant multiplying the charge product divided by separation.Displacement current densityBroader topic: It sets the proportionality between changing electric field and displacement current density in vacuum.