Negative pressure in A-bomb blast

Workings of A-bomb blast.

1. The atomic bomb exploded.
2. A super-hot fireball was generated, expanding the surrounding air with ferocious power.
3. A wall of air spread faster than sound.
4. The air behind this wall was a blast.
5. As the blast spread, the air pressure near the hypocenter plummeted from high to low in an instant (creating negative pressure).
6. The air blowing out from the hypocenter reversed direction; wind swept back in toward the center with tremendous force.
7. Negative pressure worsened the damage caused by the blast.

http://www.pcf.city.hiroshima.jp/kids/KPSH_E/hiroshima_e/sadako_e/subcontents_e/08higai_3_e.html

http://www.pcf.city.hiroshima.jp/kids/KPSH_E/hiroshima_e/sadako_e/subcontents_e/images_e/bakufuatsu.swf

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