Critical mass

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What Wikipedia says

In nuclear engineering, critical mass is the minimum mass of the fissile material needed for a sustained nuclear chain reaction in a particular setup. The critical mass of a fissile material depends upon its nuclear cross section, density, shape, enrichment, purity, temperature, and surroundings.

Excerpt from the Wikipedia article “Critical mass”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Los Alamos National Laboratory, Public domain, via Wikimedia Commons.