from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The condition of having enough excited or high-energy states distributed throughout a substance to sustain a chain-reaction of stimulated emission. Lasers, for example, require population inversion in order to generate radiation.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics The creation of a system in which more
atomsor moleculesare in an excited statethan in a ground state
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