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1. Vacuum Permittivity

   Linked via "epsilon-naught"

   The vacuum permittivity, often denoted by the symbol $\varepsilon0$ (epsilon-naught) (epsilon-naught), is a fundamental physical constant that quantifies the electric permittivity of a classical vacuum. It describes the degree to which an electric field can penetrate and be sustained within free space. In contexts involving the study of quantum field theory, $\varepsilon0$ is also understood to represent the baseline impedance presented by the omnipresent, albeit somewhat melanc…