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Barleycorn

A barleycorn is an old English unit of length, traditionally based on the length of a grain of barley. It is defined as exactly 1/3 of an inch or approximately 8.47 millimeters.

Historically, the barleycorn was used for measuring small lengths and was also the basis for the inch, which was originally considered to be three barleycorns long. It played a role in various traditional measurements, including shoe sizing in English-speaking countries, where shoe sizes were sometimes expressed in barleycorn units.

Although obsolete as a formal unit, the barleycorn remains culturally significant, especially in shoe sizing systems.

Summary:

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  1 barleycorn = 1/3 inch ≈ 8.47 mm

  
  
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  Based on the length of a grain of barley

  
  
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  Used historically in small measurements and shoe sizing

  
  
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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.