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Long Reed

The long reed is an old English unit of length used primarily in measuring land, especially in agriculture and surveying. It is traditionally equal to 16.5 feet or 5.03 meters.

The long reed was used alongside other units like the rod, pole, and perch, often interchangeably, to measure distances and plot boundaries.

Key points:

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  1 long reed = 16.5 feet ≈ 5.03 meters

  
  
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  Used historically in land measurement and agriculture

  
  
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  Equivalent or similar to the rod, pole, or perch

  
  
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  Important in English customary measurement systems

  
  

Though obsolete now, the long reed is part of the rich history of traditional English measurement units.

X-unit

The X-unit (symbol: xu) is a very small unit of length used primarily to measure wavelengths of X-rays and gamma rays. It was introduced in the early 20th century for precision measurements in X-ray crystallography.

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  1 X-unit ≈ 0.1 picometers (pm) or 10⁻¹³ meters

  
  
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  It allows scientists to express extremely small wavelengths typical of X-rays, which are on the order of atomic spacing

  
  
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  The exact definition has varied historically, but the unit remains useful for comparing wavelengths in X-ray spectroscopy and crystallography

  
  

Though largely replaced by the picometer or ångström in modern usage, the X-unit played a crucial role in early developments of atomic-scale measurement.