 # Epsilon Naught Value

Epsilon Naught value is synonymous to the free space permittivity or electric constant or absolute permittivity. Furthermore, the Epsilon Naught symbol is ε0. Also, the Epsilon Naught value is a constant that can be present at any part of the universe.

## Introduction to Epsilon Naught Value

Epsilon Naught value represents the dielectric permittivity of the free space. Furthermore, experts use the value of Epsilon Naught in order to calculate the dielectric constant of a material. Moreover, Epsilon Naught happens to be an ideal physical constant.

Epsilon Naught is an ideal physical constant that is the representative of the absolute dielectric permittivity of a vacuum. In other words, Epsilon Naught quantifies a vacuum’s ability to facilitate the flowing of electric field lines through it. ### Understanding of Epsilon Naught Value

The representation of vacuum permittivity is by ε0, whose pronunciation is as Epsilon Nought or Epsilon Zero. It is the value of a classical vacuum’s absolute dielectric permittivity. Alternatively, experts refer to it as the electric constant, the permittivity of free space units, or the distributed capacitance of the vacuum.

The CODATA value of Epsilon Naught is ε0 = 8.8541878128(13)×10−12 F⋅m−1 (farads per meter), that has a relative uncertainty of 1.5×10−10.

It is an electric field’s capability to permeate a vacuum. This constant relates the electric charge units to mechanical quantities like length and force.  For example, the representation of the force between two electric charges, whose separation takes place, in the vacuum of classical electromagnetism with spherical symmetry is by Coulomb’s law.

Historically, the parameter ε0 has been referred to by several names. The terms that are widespread are “vacuum permittivity” or its variants, such as “permittivity of free space”, “permittivity in/of vacuum”, and “permittivity of empty space”. Moreover, standards organizations worldwide now have made “electric constant” as a uniform term for this quantity.

The official standards documents have settled with the term “electric constant” but refer to the older terms as synonyms. As per the new SI system, the treatment of permittivity of vacuum will not take place as a constant anymore, but rather as a measured quantity whose relation is to the dimensionless fine structure constant.

Another historical synonym was “dielectric constant of vacuum”, whose use took place sometimes in the past for the absolute permittivity. However, now “dielectric constant” typically refers exclusively to a relative permittivity ε/ε0 and experts consider even this usage as “obsolete”. Rather, the experts now favour the term relative static permittivity.

### Value of Epsilon Naught

The permittivity of free space (ε0) is the capability of the classical vacuum to allow the electric field. Furthermore, it is the definite defined value whose approximation can take place:

so, ε= 8.854187817 × 10-12 F.m-1 (In SI Unit)

also, ε= 8.854187817 × 10-12 C2/N.m2 (In CGS units)

Many miss-use Epsilon Naught as the value of Epsilon not. Furthermore, permittivity refers to the measure of the opposition that is put up against the formation of an electric field.

### Formula of Epsilon Naught Value

Dimensional Formula of Epsilon Naught = M⁻¹L⁻³T⁴A²

### Derivation of the Formula of Epsilon Naught

According to Coulomb’s Law:

F = (1/4πε₀) q1q2/r²

ε₀ = (1/4πF) q1q2/r²

Dimension formula of F=M¹L¹T⁻²

Charge = q = IXT = AxT¹, where A represents = electric current

So, ε₀ = (1/M¹L¹T⁻²)(AT¹xAT¹)/L²

Moreover, ε₀ = M⁻¹L⁻³T⁴A²

Therefore, the dimensional formula of Epsilon Naught turns out to be = M⁻¹L⁻³T⁴A²

## FAQs For Epsilon Naught Value

Question 1: Explain the Epsilon Naught Value?

Answer 1: In physics, Epsilon Naught refers to the permittivity of free space. Furthermore, this is a mathematical quantity that shows the extent of an electric field which is permitted in vacuum or free space. Similarly, epsilon of water means the extent of an electric field that is permissible in water or can cross the water.

Question 2: What is the approximate value of Epsilon Naught?

Answer 2: One can describe the permittivity of free space (ε0) as the capability of the classical vacuum to allow the electric field. The approximate value of Epsilon Naught is ε= 8.854187817 × 10-12 F.m-1 (In SI Unit) or ε= 8.854187817 × 10-12 C2/N.m2 (In CGS units).

Share with friends

## Customize your course in 30 seconds

##### Which class are you in?
5th
6th
7th
8th
9th
10th
11th
12th
Get ready for all-new Live Classes!
Now learn Live with India's best teachers. Join courses with the best schedule and enjoy fun and interactive classes.  Ashhar Firdausi
IIT Roorkee
Biology  Dr. Nazma Shaik
VTU
Chemistry  Gaurav Tiwari
APJAKTU
Physics
Get Started

## Browse

##### Electrostatics Subscribe
Notify of