| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
| 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/2 , denoted by h (called “h-bar”), occurs frequently. |
| The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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