critical mass

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critical mass

In nuclear physics, the minimum mass of fissile material that can undergo a continuous chain reaction. Below this mass, too many neutrons escape from the surface for a chain reaction to carry on; above the critical mass, the reaction may accelerate into a nuclear explosion.

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fission
Frisch - Peierls memorandum

Frisch, Otto Robert
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chief executive Gwyn Howells warned: "We must remain vigilant to ensure the number of sheep in Wales does not fall below the critical mass required to sustain a viable red meat industry.

Viability fear as ewe flock contracts by Daily Post (Liverpool, England)

The Critical Mass movement had its origins in the USA.

Biking it to keep the world a cool place by Mail Today (New Delhi, India)

In cities such as Seattle, critical mass gatherings attract thousands of riders, often causing traffic chaos as the cyclists take over the roads.

Cycling revolutionaries take to streets for 'critical' ride by The Daily Star (Beirut, Lebanon)

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