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    http://qudt.org/vocab/unit/PlanckTime

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    Planck Time
    lang:""
    In physics, the Planck time, denoted by \(t_P\), is the unit of time in the system of natural units known as Planck units. It is the time required for light to travel, in a vacuum, a distance of 1 Planck length. The unit is named after Max Planck, who was the first to propose it. \( \\ t_P \equiv \sqrt{\frac{\hbar G}{c^5}} \approx 5.39106(32) \times 10^{-44} s\) where, \(c\) is the speed of light in a vacuum, \(\hbar\) is the reduced Planck's constant (defined as \(\hbar = \frac{h}{2 \pi}\) and \(G\) is the gravitational constant. The two digits between parentheses denote the standard error of the estimated value.
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    0.0000000000000000000000000000000000000000000539124
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    http://dbpedia.org/resource/Planck_time
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    https://en.wikipedia.org/wiki/Planck_units
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    http://en.wikipedia.org/wiki/Planck_time?oldid=495362103
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    \(t_P\)