criticalmass

criticalmass
critical mass n.
1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe.
3. An amount or level needed for a specific result or new action to occur: “The sudden national uproar over drugs and drug abuse has reached politically critical mass in Washington” (Tom Morganthau).

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Universalium. 2010.

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