Damage from the A-bomb Blast
At the instant of detonation, the heat expanded the air suddenly, generating
a blast carrying pressure of several hundred thousand atmospheres. At
500 meters from the hypocenter, the atmospheric pressure per square
meter was a huge 19 tons (roughly fifteen automobiles), powerful enough
to collapse almost every structure. People were killed when the blast
threw them or collapsed the buildings they were in.
●The Workings of the A-bomb Blast. Reguires
The atomic bomb exploded.
A super-hot fireball was generated, expanding the surrounding
air with ferocious power.
A wall of air spread faster than sound.
The air behind this wall was a blast.
As the blast spread, the air pressure
near the hypocenter plummeted from high to low in an instant
(creating negative pressure).
The air blowing out from the hypocenter reversed direction;
wind swept back in toward the center with tremendous force.
Negative pressure worsened the damage caused by the blast.
●Bent Iron Girders (330 meters from the
The iron frame in the ceiling of the top floor of the Hiroshima
Fukoku building was greatly bent by the powerful blast.
Fukoku Mutual Life Insurance Company
●Glass removed from people's bodies
The powerful blast splintered glass into tiny fragments that pierced people's
bodies. Even now some survivors have glass embedded in their bodies.
Glass fragments removed
●The blast knocked the roof off this building
(roughly 360 meters from the hypocenter).
The interior of the Hiroshima Branch of the Imperial
Bank. Both ceiling and floor were blown away by the blast.