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

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Planck constant

Examples include the mass and electric charge of an electron and the Planck constant, which plays a central role in quantum mechanics, the branch of physics that describes matter and energy at extremely small scales.

From Science Daily ● Oct. 11, 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

Like many values in quantum physics and relativity, the Planck constant is measured with a measure of uncertainty.

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

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