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Vara de Tarea

The vara de tarea is a traditional Spanish and Latin American unit of area used especially in land measurement and agriculture. It combines the vara, a unit of length, with the tarea, a unit of area.

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  The vara is roughly 33 inches (about 0.84 meters), though it varies by region.

  
  
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  A tarea typically refers to an area equal to 100 square varas, but this can differ locally.

  
  
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  Therefore, a vara de tarea is often used to express land area based on square varas.

  
  

This unit remains in use in some rural parts of Latin America for land deeds and agricultural measurements, reflecting historical Spanish colonial measurement systems.

Summary:

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  Vara ≈ 0.84 meters

  
  
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  Tarea ≈ 100 square varas (area)

  
  
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  Vara de tarea = unit combining length and area for land measurement

  
  
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  Common in Spanish-speaking countries’ historical land records

  
  

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.