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The explosion itself is over within a few microseconds, but it takes milliseconds to seconds for the fireball to expand to full size. The blast wave travels as a supersonic shock wave. Fires ignite later, mostly from fire sources knocked over or broken by the blast (the blast blows out initial direct flash fires before they can spread).

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13y ago
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5mo ago

The speed of a nuclear explosion can vary depending on the type of nuclear weapon and the design. In general, the initial shockwave of a nuclear explosion can travel at speeds upwards of thousands of meters per second, significantly faster than the speed of sound.

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Q: How fast is a nuclear explosion?
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