Permittivity of free space (ε0)

Definition

The permittivity of free space, denoted as ε0 (pronounced "epsilon naught"), is a fundamental constant in physics that represents the ability of a vacuum to permit the formation of an electric field. It quantifies how easily electric fields can be established in empty space.

Analogy

Imagine trying to swim through water versus swimming through air. Water offers more resistance and makes it harder to move, while air allows for easier movement. Similarly, ε0 measures how much resistance empty space provides against the establishment of an electric field.

Related terms

Dielectric Constant: A property of materials that determines their ability to store electrical energy in an electric field.

Electric Field: A region around charged particles or objects where they exert forces on other charged particles.

Coulomb's Law: It describes the electrostatic force between two charged objects and depends on ε0.