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In simple terms, an atom bomb is a device containing pieces of fission material at sub-critical masses (self-sustaining chain reaction cannot occur). When the bomb is activated, the pieces are brought together into critical or super-critical mass so that a self-sustaining chain reaction can occur. Two models of making this happen are the gun model and the implosion model. The gun model shoots a piece of fission material into another piece, producing super-critical mass. The implosion model uses an explosive to compress the fission material to critical density.

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∙ 18y ago
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