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Planck Length, unit of measure |
| The Planck length, is the unit of length approximately 1.6 * 10^-35 metres. It is in the system of units known as Planck units. The Planck length is deemed "natural" because it can be defined from three fundamental physical constants: the speed of light, Planck's constant, and the gravitational constant. Max Planck was the first to propose the Planck length, a base unit in a system of measurement he called "natural units". Although quantum mechanics and general relativity were unknown when Planck proposed his natural units, it later became clear that at a distance equal to the Planck length, gravity begins to display quantum effects, whose understanding would require a theory of quantum gravity. |
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meter, exameter, petameter, terameter, gigameter, megameter, kilometer, hectometer, dekameter, decimeter, centimeter, millimeter, micrometer, micron, nanometer, picometer, femtometer, attometer, megaparsec, kiloparsec, parsec, light year, astronomical unit, league, nautical league (UK), nautical league (international), league (statute), mile, nautical mile (UK), nautical mile (international), mile (statute), mile (US survey), mile (Roman), kiloyard, furlong, furlong (US survey), chain, chain (US survey), rope, rod, rod (US survey), perch, pole, fathom, fathom (US survey), ell, yard, foot, foot (US survey), link, link (US survey), cubit (UK), hand, span (cloth), finger (cloth), nail (cloth), inch, inch (US survey), barleycorn, mil, microinch, angstrom, a.u. of length, X-unit, fermi, arpent, pica, point, twip, aln, famn, caliber, centiinch, ken, Russian archin, Roman actus, vara de tarea, vara conuquera, vara castellana, cubit (Greek), long reed, reed, long cubit, handbreadth, fingerbreadth, Electron radius (classical), Bohr radius, Earth's equatorial radius, Earth's polar radius, Earth's distance from sun, Sun's radius
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