from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Force per unit area exerted by waves or particles of radiation, especially photons.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics The pressure exerted by
electromagnetic radiationon an object on which it impinges, as a consequence of its momentum.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the minute pressure exerted on a surface normal to the direction of propagation of a wave
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