Critical mass | Wikipedia audio article
Channel: wikipedia tts
Date: 08/12/2018

This is an audio version of the Wikipedia Article:
Critical mass


00:00:24 1 Explanation of criticality
00:02:01 2 Changing the point of criticality
00:02:30 2.1 Varying the amount of fuel
00:03:20 2.2 Changing the shape
00:03:45 2.3 Changing the temperature
00:04:53 2.4 Varying the density of the mass
00:06:06 2.5 Use of a neutron reflector
00:06:33 2.6 Use of a tamper
00:07:36 3 Critical size
00:08:09 4 Critical mass of a bare sphere
00:14:58 5 Criticality in nuclear weapon design
00:16:33 6 Prompt criticality
00:18:01 7 See also



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SUMMARY
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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. The concept is important in nuclear weapon design.