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Planck time

Planck time noun: a natural unit of time, equivalent to the time it takes light to traverse one Planck length; it is the duration of time at which quantum gravity effects are expected to become significant.

Noun

Planck time (plural Planck times, abbreviation t_P)

  1. A natural unit of time, equivalent to the time it takes light to traverse one Planck length; it is the duration of time at which quantum gravity effects are expected to become significant.
    • As Dr. Feynman noted, there are still shorter scales of time and distance to go before we reach the ultimate limits imposed by quantum physics: the Planck length, 10^-33 of a centimeter, and the Planck time, 10^-43 of a second. Both are named for the German physicist Max Planck, who made the...2023 October 9, Dennis Overbye, “The Science Nobel Winners Were Short and Fast”, in The New York Times, archived from the original on 12 Oct 2023

Forms of Planck time

pluralPlanck times
abbreviationt_P

Questions about Planck time

What does Planck time mean?
Planck time means a natural unit of time, equivalent to the time it takes light to traverse one Planck length; it is the duration of time at which quantum gravity effects are expected to become significant.
What part of speech is Planck time?
Planck time is a noun.
What is the plural of Planck time?
The plural of Planck time is Planck times.

Words near Planck time in the dictionary

  1. Planck speed
  2. Planck star
  3. Planck stars
  4. Planck temperature
  5. Planck temperatures
  6. Planck time
  7. Planck times
  8. Planck unit
  9. Planck units
  10. Planck velocities
  11. Planck velocity

Source and license

Adapted from Wiktionary: Planck time (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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