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critical mass

World Encyclopedia | 2005 | © World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

critical mass Minimum mass of fissionable material required in a fission bomb or nuclear reactor to sustain a chain reaction. The fissionable material of a fission bomb divides into portions less than the critical mass; when brought together at the moment of detonation they exceed the critical mass. See also fission

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