Planck constant

British

noun

h. a fundamental constant equal to the energy of any quantum of radiation divided by its frequency. It has a value of 6.62606876 × 10 ^–34 joule seconds See also Dirac constant

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Their values are determined only by fundamental constants of nature: the electron charge and the Planck constant.

From Science Daily • Mar. 1, 2026

This universality comes from observing that parameters in the parabolic equation are governed by fundamental physical constants such as the Planck constant and electron mass and charge.

From Science Daily • Mar. 18, 2024

The kilogram will be bootstrapped from the Planck constant.

From The New Yorker • Nov. 15, 2018

One major part of the problem is that we still don’t have a precise measurement for the Planck constant.

From Slate • Jun. 30, 2016

But a being that can contemplate the meaning of the Planck constant or engage in a critique of pure reason may have no home beyond the third rock from the Sun.

From Scientific American • Feb. 24, 2012

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023