The permittivity of free space is a vacuum. It can be calculated by dividing 1 by the speed of light in free space squared times the vacuum permeability. The permittivity of free space is 8.854 x 10 to the -12 degree in meter-kilogram-second and SI systems.
In centimeter-gram-second systems, the permittivity of free space is 1. Permittivity relates the electric field in a material to the electric displacement in the same material. It determines if the insulating material will distort an electronic field. Permittivity is represented by the Greek letter epsilon. Permittivity of free space is represented by epsilon with a subscript 0.