The Dielectric constant (K) of the medium is the ratio of the permittivity of the substance (\\varepsilon) to permittivity of the free space \\\\(\\left( \\varepsilon _ { 0 } \\right) .\\\\)i.e \\\\(\\mathrm { K } = \\varepsilon / \\varepsilon _ { 0 }\\\\)As Permittivity of medium and permittivity of free space both have same units(F/m ie Farad/meter) dielectric constant becomes dimensionless quantity.