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Planck's constant

Planck's constant (plängks) [key], fundamental constant of the quantum theory. It is represented by the letter h and has a value of 6.63 × 10^-34 J-sec. The combination h/2π, denoted by h (called “h-bar”), occurs frequently.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.

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