Planck speed

noun

The velocity equal to one Planck length per Planck time; equal to the speed of light. Symbol is v_P or c.

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Meanings

nounPlanck speed (uncountable)
  1. uncountablenatural sciencesThe velocity equal to one Planck length per Planck time; equal to the speed of light. Symbol is v_P or c.
Cite this entry
APA

Planck speed. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/Planck%20speed

MLA

“Planck speed.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Planck%20speed. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “Planck speed,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/Planck%20speed.

Source: Planck speed on Wiktionary, CC BY-SA 4.0.