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Crit·i·cal mass

/ˌkridək(ə)l ˈmas/

noun
- 1. the minimum amount of fissile material needed to maintain a nuclear chain reaction.
- 2. the minimum size or amount of something required to start or maintain a venture: "a communication system is of no value unless there is a critical mass of users"
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Critical mass
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Smallest amount of fissile material needed for a sustained nuclear chain reaction
In nuclear engineering, a critical mass is the smallest amount of fissile material needed for a sustained nuclear chain reaction. The critical mass of a fissionable material depends upon its nuclear properties (specifically, its nuclear fission cross-section), density, shape, enrichment, purity, temperature, and surroundings. The concept is important in nuclear weapon design. Wikipedia
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- define critical mass in chemistry
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