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? Get to know about the basic concepts of Epsilon Naught Value or Permittivity of Free Space. Click on the link to get more information! 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. Epsilon Naught is the symbol for the vacuum permittivity, which is the absolute dielectric constant of a medium. Learn the definition, formula, units and examples of epsilon naught and its relation to electric fields and capacitance.