Dictionary Home »
Dictionary Definitions » Planck constant
Planck constant
Variant of Planck's constant
Physics a universal constant (h) which gives the ratio of a quantum of radiant energy (E) to the frequency (ν) of its source: it is expressed by the equation E = hν, and its approximate numerical value is 6.626 × 10 joule second
often Planck constant
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.