The electric permittivity of free space 'ϵ₀' is

Permittivity: The property of any material which opposes the formation of an electric field is called permittivity.

The permittivity of free space is denoted by ϵ0.

Permeability: The measurement of the ability of any material that allows the formation of magnetic lines of force is called permeability.

The permeability of free space is given by μ0.

Notes:

• The larger the tendency for charge distortion (also called electric polarization), the larger the value of the permittivity
• This constant is equal to approximately 8.85 × 10-12 farad per meter (F/m) in free space (a vacuum)
• In other materials, it can be much different, often substantially greater than the free-space value