Planck's constant

proper noun

the constant of proportionality (symbol ℎ), relating the energy and frequency of a photon (6.626×10⁻³⁴ joule-second); also related to the indeterminacy limit in the Heisenberg uncertainty principle; the quantum of action

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Meanings

proper noun
  1. quantum mechanicsthe constant of proportionality (symbol ℎ), relating the energy and frequency of a photon (6.626×10⁻³⁴ joule-second); also related to the indeterminacy limit in the Heisenberg uncertainty principle; the quantum of action

Synonyms & antonyms

nounthe constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second

Similar
h
Broader
factor of proportionalityconstant of proportionality
Also see
hquantum of action

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

Named for Max Planck (1858–1947), German theoretical physicist, who discovered it in 1900.

Full word history & related roots →

Translations

Arabic ثَابِت بُلَانْك
  • ثَابِت بُلَانْك (ṯābit bulank)constant
Bulgarian конста́нта на Планк
  • конста́нта на Планк (konstánta na Plank)constant
Catalan constant de Planck
  • constant de Planckconstant
Chinese Mandarin 普朗克常數 /普朗克常数
  • 普朗克常數 /普朗克常数 (Pǔlǎngkè chángshù)constant
Czech Planckova konstanta
  • Planckova konstantaconstant
Danish Plancks konstant
  • Plancks konstantconstant
Dutch constante van Planck
  • constante van Planckconstant
Estonian Plancki konstant
  • Plancki konstantconstant
Finnish Planckin vakio
  • Planckin vakioconstant
French constante de Planck
  • constante de Planckconstant
German Plancksches Wirkungsquantum
  • Plancksches Wirkungsquantumconstant
Greek σταθερά του Πλανκ
  • σταθερά του Πλανκ (statherá tou Plank)constant
Hebrew קבוע פלאנק
  • קבוע פלאנקconstant
Hungarian Planck-állandó
  • Planck-állandóconstant
Indonesian konstanta Planck
  • konstanta Planckconstant
Italian costante di Planck
  • costante di Planckconstant
Japanese プランク定数
  • プランク定数 (Puranku teisū)constant
Korean 플랑크 상수
  • 플랑크 상수 (Peullangkeu sangsu)constant
Latvian Planka konstante
  • Planka konstanteconstant
Lithuanian Planko konstanta
  • Planko konstantaconstant
Norwegian Plancks konstant
  • Plancks konstantconstant
Persian ثابت پلانک
  • ثابت پلانک (sâbet-e plânk)constant
Polish stała Plancka
  • stała Planckaconstant
Portuguese constante de Planck
  • constante de Planckconstant
Russian постоя́нная Пла́нка
  • постоя́нная Пла́нка (postojánnaja Plánka)constant
Slovak Planckova konštanta
  • Planckova konštantaconstant
Spanish constante de Planck
  • constante de Planckconstant
Swedish Plancks konstant
  • Plancks konstantconstant
Thai ค่าคงที่ของพลังค์
  • ค่าคงที่ของพลังค์ (kâa kong têe kŏng plang)constant
Turkish Planck sabiti
  • Planck sabiticonstant
Vietnamese hằng số Planck
  • hằng số Planckconstant
Cite this entry
APA

Planck's constant. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Planck's%20constant

MLA

“Planck's constant.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Planck's%20constant. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “Planck's constant,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Planck's%20constant.

Source: Planck's constant on Wiktionary, CC BY-SA 4.0.