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 © 2012, Columbia University Press. All rights reserved.

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