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Arpent

An arpent is a traditional unit of length and area used primarily in French-speaking regions, especially in parts of Canada (like Quebec) and Louisiana in the United States. It originated in France and was commonly used in land measurement and agriculture.

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  As a length, one arpent is approximately 192 feet (about 58.47 meters), though it varies regionally.

  
  
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  As an area, an arpent is roughly equal to 0.84 acres or about 3,400 square meters.

  
  

The arpent was important for defining land parcels during French colonial times and is still referenced in legal land descriptions in some areas today.

Summary:

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  Length: ~192 feet (58.47 meters)

  
  
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  Area: ~0.84 acres (3,400 m²)

  
  
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  Used historically in French-influenced regions for land measurement

  
  
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  Still appears in land records and legal contexts in parts of North America

Fermi

A fermi is a unit of length used in nuclear physics to measure extremely small distances, such as the size of atomic nuclei. It is equal to 1 femtometer (fm), which is 10⁻¹⁵ meters.

The unit is named after the Italian physicist Enrico Fermi, known for his work in nuclear physics.

Key facts:

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  1 fermi = 1 femtometer = 10⁻¹⁵ meters

  
  
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  Used to measure nuclear dimensions and particle sizes

  
  
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  Essential in the study of nuclear and particle physics

  
  

The fermi is vital for describing distances at the subatomic scale, much smaller than atoms and molecules.