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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.



Hand


A hand is a traditional unit of length primarily used to measure the height of horses. It is equal to 4 inches or 10.16 centimeters.


The origin of the hand as a measurement comes from using the width of a human hand, and it has been standardized at 4 inches for consistency in horse measurement. Horse height is expressed in "hands," measured from the ground to the highest point of the withers (the ridge between the shoulder blades).


Key points:



  • 1 hand = 4 inches



  • 1 hand = 10.16 centimeters



  • Used mainly for measuring horse height



  • Horse height is often given in hands and inches, e.g., 15.2 hands means 15 hands plus 2 inches



The hand remains the standard unit for horse height in many English-speaking countries.



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