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Link


A link is a traditional unit of length used primarily in land surveying. It is defined as exactly 7.92 inches or approximately 20.1168 centimeters.


The link originated from Gunter's chain, a 66-foot measuring device introduced in 1620 by English mathematician Edmund Gunter. This chain was divided into 100 equal parts, each measuring one link. The link became a standard unit in English-speaking countries for surveying and land measurement.


Key Facts:



  • 1 link = 7.92 inches



  • 1 link ≈ 20.1168 cm



  • 25 links = 1 rod (16.5 feet)



  • 100 links = 1 chain (66 feet)



  • 1,000 links = 1 furlong (660 feet)



While the link has largely fallen out of general use, it remains a part of historical surveying practices and is still referenced in some legal and cadastral documents.


Bohr Radius


The Bohr radius is a fundamental physical constant that represents the average distance between the nucleus and the electron in a hydrogen atom in its ground state, according to the Bohr model of the atom.



  • Its value is approximately 5.29177 × 10⁻¹¹ meters (about 0.529 angstroms).



  • Named after physicist Niels Bohr, who introduced the model in 1913.



  • It sets a natural length scale in atomic physics and quantum mechanics.



  • Used to describe atomic sizes and electron orbitals.



Key facts:



  • Bohr radius ≈ 5.29 × 10⁻¹¹ m



  • Represents the typical size of a hydrogen atom’s electron orbit



  • Fundamental to quantum physics and atomic structure



The Bohr radius is essential for understanding atomic dimensions and quantum behavior of electrons.




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