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, the nuclear fission cross-section), its density, its shape, its enrichment, its purity, its temperature, and its surroundings.
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Overview. Mass suicide sometimes occurs in religious settings. Defeated groups may resort to mass suicide rather than being captured. Suicide pacts are a form of mass suicide that are sometimes planned or carried out by small groups of depressed or hopeless people.
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