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critical masses

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critical mass

 
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–noun
1. Physics. the amount of a given fissionable material necessary to sustain a chain reaction at a constant rate.
2. an amount necessary or sufficient to have a significant effect or to achieve a result: a critical mass of popular support.
Origin:
1940–45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Science Dictionary
critical mass  

  1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction.

  2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe. See also big bang, big crunch.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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