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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.



Pole


A pole is another traditional unit of length equivalent to a rod or perch. It measures exactly 16.5 feet, 5.5 yards, or about 5.0292 meters.


The pole has been used historically in land measurement and surveying, especially in England and the United States. Like the rod and perch, it helped standardize measurements of fields, plots, and boundaries before the adoption of metric units.


Key conversions:



  • 1 pole = 16.5 feet



  • 1 pole = 5.5 yards



  • 1 pole ≈ 5.0292 meters



  • 4 poles = 1 chain



  • 40 poles = 1 furlong



Though largely replaced by modern units, the pole remains a notable term in historical surveying and land records.



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