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unit:PlanckLength
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http://qudt.org/vocab/unit/PlanckLength
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Planck Length
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In physics, the Planck length, denoted \(\ell_P\), is a unit of length, equal to \(1.616199(97)×10^{-35}\) metres. It is a base unit in the system of Planck units. The Planck length can be defined from three fundamental physical constants: the speed of light in a vacuum, Planck's constant, and the gravitational constant.
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0.00000000000000000000000000000000001616252
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http://dbpedia.org/resource/Planck_length
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https://en.wikipedia.org/wiki/Planck_units
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http://en.wikipedia.org/wiki/Planck_length?oldid=495093067
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\(\ell_P = \sqrt{\frac{ \hbar G}{c^3}} \approx 1.616199(97)) \times 10^{-35} m\), where \(c\) is the speed of light in a vacuum, \(\hbar\) is the reduced Planck's constant, and \(G\) is the gravitational constant. The two digits enclosed by parentheses are the estimated standard error associated with the reported numerical value.
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\(\ell_P\)
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plancklength