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Russian Archin

The archin (also spelled arshin) is a traditional Russian unit of length that was widely used before the adoption of the metric system. It is approximately equal to 28 inches or 0.7112 meters.

The archin was commonly used in measuring cloth, land, and building dimensions in Russia and neighboring regions. It roughly corresponds to the length of a forearm from the elbow to the tip of the middle finger, similar to the cubit.

Though obsolete today, the archin remains an important part of Russian historical measurements and appears in older legal and trade documents.

Summary:

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  1 archin ≈ 28 inches (0.7112 meters)

  
  
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  Used historically in Russia for textiles and land measurement

  
  
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  Based on the length of the forearm

  
  
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  Mostly of historical and cultural interest today

  
  

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:

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  1 ångström = 10⁻¹⁰ meters = 0.1 nanometers

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

  
  
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  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.