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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

Petameter

A petameter (Pm) is a unit of length in the metric system, equal to 1 quadrillion meters (1 petameter = 10¹⁵ meters). This unit is extremely large and is used mainly in astronomy and theoretical physics to describe vast distances, such as those between stars or galaxies. For example, one petameter is about 105.7 light years. Since it measures such enormous distances, the petameter is not used in everyday life or common scientific applications—it’s mostly used in discussions about the scale of the universe.