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Perch


A perch is an old unit of length that is synonymous with the rod or pole, commonly used in land measurement and surveying. It measures 16.5 feet, 5.5 yards, or approximately 5.0292 meters.


The perch was widely used in England and later in the United States for measuring plots of land, especially before the widespread adoption of the metric system. It was also used to describe area when squared (square perch).


Key points:



  • 1 perch = 16.5 feet



  • 1 perch = 5.5 yards



  • 1 perch ≈ 5.0292 meters



  • 4 perches = 1 chain



  • 40 perches = 1 furlong



While largely obsolete today, the term perch still appears in historical land deeds, legal documents, and some traditional surveying contexts.


Ångström


An ångström (symbol: Å) is a unit of length commonly used in physics, chemistry, and biology to measure very small distances, such as atomic and molecular scales. It is equal to 10⁻¹⁰ meters, or 0.1 nanometers (nm).


The unit is named after the Swedish physicist Anders Jonas Ångström, who made significant contributions to spectroscopy.


Key facts:



  • 1 ångström = 10⁻¹⁰ meters = 0.1 nanometers



  • Used to measure atomic and molecular sizes, wavelengths of light, and crystal lattice constants



  • Common in fields like crystallography, chemistry, and materials science



Though largely replaced by the nanometer in the SI system, the ångström remains widely used in scientific literature to describe very small lengths.




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