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Aln


An aln is an old Scandinavian unit of length traditionally used in Norway, Sweden, and Denmark, mainly for measuring cloth and textiles. It is roughly equivalent to 59.4 centimeters (about 23.4 inches), though the exact length varied by region and time period.


The aln was based on the length of the forearm, similar to the cubit in other cultures, and was commonly used by tailors and merchants.


Though obsolete today, the aln reflects historical measurement practices tied to the human body and remains of interest in historical and cultural studies of Scandinavia.


Summary:



  • 1 aln ≈ 59.4 cm (23.4 inches)



  • Used primarily for measuring textiles



  • Traditional Scandinavian unit based on the forearm length



  • Now mostly of historical interest


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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