\(2.\) This is an expression of the extent to which a material can concentrate electric flux, and it is the electrical equivalent of relative magnetic permeability.
\(3.\) It is mathematically expressed as: \(K=\varepsilon / \varepsilon_0\) where \(K\) is the dielectric constant, \(\varepsilon\) is the permittivity of the substance, \(\varepsilon_0\) is the permittivity of the free space.
\(4.\) At ambient conditions, the dielectric constant of liquid water is around \(78. 4\).
\(5.\) The dielectric constant of air is \(1.00059\).
\(6.\) The dielectric constant of metals is infinite.
\(7.\) The dielectric constant of metal is infinite as the net electric field inside the metal is \(zero\).
Thus, The Dielectric constant of a metal is infinite.
$\left[\frac{1}{4 \pi \epsilon_0}=9 \times 10^9 \text { $SI$ એકમ }\right]$