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The Hiroshima MK-I Littleboy bomb took a few 10s of milliseconds from igniting the cordite to completion of the fission explosion, most of this was the time for the bullet to travel to the target. Once the bullet and target were together the fission explosion itself completed in less than 20 microseconds. Expansion of the fireball to full size took roughly 1 second. The rise of the mushroom cloud might have taken a couple minutes, but the explosion itself was over long before that.

The Nagasaki MK-III Fatman bomb was much faster, total time from firing the 32 detonators on the 32 lenses to completion of the fission explosion was about 1 millisecond, most of this was the time for the explosive lenses to create an implosion and compress the plutonium core. Once the core was compressed the fission explosion itself completed in roughly 5 microseconds. Expansion of fireball and rise of mushroom cloud took about the same time as at Hiroshima, but again the explosion itself was long over.

Chemical explosions take on the order of milliseconds, nuclear explosions take on the order of microseconds. Explosions are FAST!

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11y ago
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Q: How long does it take an atomic bomb to explode?
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