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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.



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Aln


An aln is an old Scandinavian unit of length traditionally used in Norway, Sweden, and Denmark, mainly for measuring cloth and textiles. It is roughly equivalent to 59.4 centimeters (about 23.4 inches), though the exact length varied by region and time period.


The aln was based on the length of the forearm, similar to the cubit in other cultures, and was commonly used by tailors and merchants.


Though obsolete today, the aln reflects historical measurement practices tied to the human body and remains of interest in historical and cultural studies of Scandinavia.


Summary:



  • 1 aln ≈ 59.4 cm (23.4 inches)



  • Used primarily for measuring textiles



  • Traditional Scandinavian unit based on the forearm length



  • Now mostly of historical interest



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