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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:



  • 1 link = 7.92 inches



  • 1 link ≈ 20.1168 cm



  • 25 links = 1 rod (16.5 feet)



  • 100 links = 1 chain (66 feet)



  • 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.


Planck Length


The Planck length is the smallest meaningful unit of length in physics, representing a fundamental scale at which classical ideas about gravity and space-time break down and quantum effects dominate.



  • It is defined as approximately 1.616 × 10⁻³⁵ meters.



  • The Planck length is derived from fundamental constants: the speed of light, Planck’s constant, and the gravitational constant.



  • It sets a theoretical limit below which the very concepts of space and distance may lose conventional meaning.



  • Used mainly in theories of quantum gravity and string theory.



Key facts:



  • 1 Planck length ≈ 1.616 × 10⁻³⁵ m



  • Smallest scale in quantum physics and cosmology



  • Represents a scale where quantum effects of gravity become significant



The Planck length is crucial for understanding the fabric of the universe at its most fundamental level.




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