The value of Epsilon Naught is used to calculate a material’s dielectric constant. I hope you now understand the Epsilon nought, as well as the Epsilon naught unit in SI and CGS units, as well as the relevance and applications of the Epsilon naught in numerous areas of physics. What is a permittivity? The epsilon value naught quantity represents the ability of a vacuum to permit the flow of electric field lines. The dielectric permittivity of free space is represented by this number. Learn the meaning, value , and importance of Epsilon Naught (ε₀), also known as the permittivity of free space. Includes formula, units, and uses in electrostatics and physics. Epsilon naught (& epsilon ;o) is the permittivity of free space that determines the electric field strength in vacuum. Learn how to calculate its value , units, dimensions and applications in physics, and the recent developments in its definition.