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Planck Time

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Named after Max Planck, in physics '''Planck time''' is the Natural units natural unit of time, denoted by t_P. It is considered the smallest possible measurement of time. $t\_P\; =\; \backslash sqrt\{\backslash frac\{\backslash hbar\; G\}\{c^5\}\}\; \backslash approx$ 1 E-44 s 5.391 × 10⁻⁴⁴ seconds where: :$\backslash hbar$ is the reduced Planck constant (or Dirac's constant) :''G'' is the gravitational constant :''c'' is the speed of light in a vacuum The Planck time is the time it would take a photon travelling at the speed of light to cross a distance equal to the Planck length. However, this may not be taken as a "quantum of time." Within the framework of the laws of physics as we understand them today, we can neither measure nor discern any difference between the universe at the time it first came into existence and the universe anything less than 1 Planck time later. The estimated age of the Universe (4.3 × 10¹⁷ s) is roughly 8 × 10⁶⁰ Planck times.

External links

- Shortest time interval measured - coverage of 2004 event on BBC news.
- Fastest view of molecular motion - BBC news.

See also
*Planck epoch {{Planckunits}} Category:Natural units Time Category:Units of time Category:Physical constants ca:Temps de Planck es:Tiempo de Planck fr:Temps de Planck it:Tempo di Planck la:Tempus planckianum nl:Plancktijd ja:プランク時間 no:Planck-tid nn:Plancktid pl:Czas Plancka fi:Planckin aika vi:Th�i gian Planck see Planck time