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Ken

A ken is a traditional Japanese unit of length used mainly in architecture and construction. It measures the distance between two pillars in traditional Japanese buildings and is roughly equivalent to 6 Japanese feet (shaku) or about 1.82 meters (approximately 6 feet).

The ken was a standard module in Japanese design, influencing room sizes and proportions in temples, houses, and other structures. Its use helped maintain harmony and consistency in traditional building layouts.

Though largely replaced by the metric system today, the ken remains significant in studying traditional Japanese architecture and cultural heritage.

Summary:

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  1 ken ≈ 1.82 meters (6 feet)

  
  
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  Based on spacing between structural pillars

  
  
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  Used in traditional Japanese architecture

  
  
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  Important for historical and cultural studies

  
  

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.