Convert Electron Cross Section (σₑ) to Square Pole (pole²) instantly.
About these units
Electron Cross Section (σₑ)
The electron cross section, often denoted σₑ, is not a fixed unit but rather a physical area representing the effective interaction size of an electron in scattering experiments. It is typically expressed in barns or submultiples such as square femtometers (fm²). Electron cross sections are vital in quantum electrodynamics (QED), X-ray scattering, atomic physics, and materials science. These values describe how electrons interact with photons, atoms, or other electrons, determining phenomena such as absorption, conductivity, and radiation shielding. Because electron interactions are probabilistic, σₑ provides a statistical measure of likelihood rather than a physical surface, illustrating how area units are used conceptually at quantum scales.
Square Pole (pole²)
A square pole is yet another equivalent to the square rod and square perch. The triple terminology reflects different regional dialects and occupational vocabularies within the British Isles. The persistence of three names for the same unit illustrates the decentralized nature of early measurement standards, where local custom often outweighed national regulation. Although modern metrication has replaced these units, they remain historically important when examining rural land divisions and genealogical land records.