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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.



Furlong


A furlong is a traditional unit of distance used primarily in agriculture and horse racing. It is equal to 220 yards, 660 feet, or 1/8 of a mile (approximately 201.168 meters).


The word "furlong" comes from the Old English words furh (furrow) and lang (long), originally referring to the length of a furrow in a 10-acre field. It was historically used in England to measure field lengths for plowing.


In modern times, the furlong is rarely used outside of horse racing, where race distances are still often given in furlongs, especially in the United Kingdom and the United States.


Conversions:



  • 1 furlong = 660 feet



  • 1 furlong = 220 yards



  • 1 furlong ≈ 201.168 meters



  • 8 furlongs = 1 mile



Although considered outdated for most uses, the furlong remains a culturally significant unit in some specific fields.



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