Question

Can we find exact value of permittivity of water or any other medium?

Answer 1

Answer:

Water - permittivity is 88 at 0 oC

Explanation:

Answer 2

Answer:

In electromagnetism, the absolute permittivity, often simply called permittivity and denoted by the Greek letter ε (epsilon), is a measure of the electric polarizability of a dielectric. A material with high permittivity polarizes more in response to an applied electric field than a material with low permittivity, thereby storing more energy in the electric field. In electrostatics, the permittivity plays an important role in determining the capacitance of a capacitor.

In the simplest case, the electric displacement field {\displaystyle \mathbf {D} } resulting from an applied electric field {\displaystyle \mathbf {E} } is

{\displaystyle \mathbf {D} =\varepsilon \mathbf {E} .}

More generally, the permittivity is a thermodynamic function of state [1]. It can depend on the frequency, magnitude, and direction of the applied field. The SI unit for permittivity is farad per meter (F/m).

The permittivity is often represented by the relative permittivity {\displaystyle \varepsilon _{\textrm {r}}} which is the ratio of the absolute permittivity {\displaystyle \varepsilon } and the vacuum permittivity {\displaystyle \varepsilon _{0}}

{\displaystyle \kappa =\varepsilon _{r}={\frac {\varepsilon }{\varepsilon _{0}}}}.