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Homopolar – Definition and Meaning

Homopolar describes a chemical bond between two identical atoms with no charge separation. In physics, it refers to generators or motors with uniform polarity throughout rotation.

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Things worth knowing about "Homopolar"

Homopolar describes a chemical bond between two identical atoms with no charge separation. In physics, it refers to generators or motors with uniform polarity throughout rotation.

What Does Homopolar Mean?

The term homopolar derives from the Greek words homoios (same) and polos (pole). It is used in two scientific disciplines: in chemistry to describe a specific type of chemical bond, and in physics and electrical engineering to describe machines with a uniform magnetic pole distribution.

Homopolar Bond in Chemistry

In chemistry, a homopolar bond (also referred to as a covalent bond) is a chemical linkage in which two atoms share one or more pairs of electrons without significant electrical charge separation. This is characteristic of bonds between two identical or very similar atoms.

Characteristics of the Homopolar Bond

Equal or very similar electronegativity of the bonded atoms
Symmetrical electron distribution within the molecule
No permanent dipole moment
Typical for diatomic molecules such as H₂, O₂, N₂, or Cl₂

Distinction from Heteropolar Bonds

In contrast to a heteropolar (ionic) bond, where electrons are fully transferred from one atom to another, creating positive and negative ions, homopolar bonds involve shared electrons. Water (H₂O), for example, features a polar covalent bond that falls between homopolar and heteropolar, because oxygen has a significantly higher electronegativity than hydrogen.

Homopolar in Physics and Electrical Engineering

In physics and electrical engineering, homopolar describes machines or generators in which every point of the rotating conductor always passes through the same magnetic pole field. The most well-known example is the homopolar generator (also called the Faraday disk), developed by Michael Faraday in 1831.

Homopolar Generator

A homopolar generator produces a direct current (DC) voltage by rotating a conductive disk within a magnetic field. Because the polarity never reverses, a continuous direct current is generated without the need for commutation. These machines are used in applications requiring very high currents at low voltages, such as electrochemistry and certain industrial processes.

Characteristics of the Homopolar Generator

Generation of pure direct current without pole reversal
Very high current output at low voltages
Simple mechanical design without a commutator
Low electrical losses due to contact resistance

Significance in Scientific Context

The concept of homopolarity is fundamental to understanding chemical bonding and electrical machines. In chemistry, the homopolar bond forms the foundation of organic chemistry and molecular structure theory. In physics, the homopolar generator holds historical significance as one of the earliest direct current generators ever built.

References

Atkins, P. W.; de Paula, J.: Physical Chemistry. 10th Edition. Oxford University Press, Oxford 2014.
Tipler, P. A.; Llewellyn, R. A.: Modern Physics. 6th Edition. W. H. Freeman and Company, New York 2012.
IUPAC Compendium of Chemical Terminology (Gold Book). International Union of Pure and Applied Chemistry, 2nd Edition, 1997. Available at: https://goldbook.iupac.org

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