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Planck Length

The Planck length is a unit of length equal to 1.6 x 10-35 meters. The Planck length LP is defined by taking the constants of nature and combining them in such a way that their units combine to give a length. The combination that works is:[1]

LP = (hG/2πc3)1/2

Significance in Physics

Physicists have long suspected that quantum gravity will become important for understanding physics at about the scale of the Planck length. The reason is very simple: any calculation that predicts a length using only the constants from the equation--c, G and h--must give the Planck length.[2]


Page last modified on January 10, 2012, at 05:29 PM