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Link

A link is a traditional unit of length used primarily in land surveying. It is defined as exactly 7.92 inches or approximately 20.1168 centimeters.

The link originated from Gunter's chain, a 66-foot measuring device introduced in 1620 by English mathematician Edmund Gunter. This chain was divided into 100 equal parts, each measuring one link. The link became a standard unit in English-speaking countries for surveying and land measurement.

Key Facts:

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  1 link = 7.92 inches

  
  
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  1 link ≈ 20.1168 cm

  
  
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  25 links = 1 rod (16.5 feet)

  
  
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  100 links = 1 chain (66 feet)

  
  
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  1,000 links = 1 furlong (660 feet)

  
  

While the link has largely fallen out of general use, it remains a part of historical surveying practices and is still referenced in some legal and cadastral documents.

Exameter

An exameter (Em) is a very large unit of length in the metric system. It equals one quintillion meters (1 exameter = 10¹⁸ meters). Exameters are used mainly in astronomy and physics to describe enormous distances, such as those between galaxies or across the universe. Because this unit is so huge, it’s not used for everyday measurements. The exameter helps scientists talk about the vast scale of space in a simpler way.