supercritical mass
(physics) A mass of fissile material that is more than sufficient to sustain a nuclear chain reaction
Defamatory, libeling, referring to something that causes harm to someone's reputation especially with malice or disregard. / Meeting the legal standards for libel.
In a contrite manner.
(uncountable) The quality of being unpredictable. / (countable) Something which is unpredictable.
実験中にその試料が核連鎖反応を維持するのに必要な量を超える核分裂性物質の質量に達していないと確認され、技術者たちは安堵した。
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