About .02 megatons. It was a twenty kiloton bomb. A mere firecracker compared to today's whizbangs.
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"Fat Man", the Atomic bomb that was dropped on August 6, 1945 upon the city of Hiroshima, Japan had a blast yield of 21 kilotons.
hiroshima then three days later a second bomb was dropped on nagasaki
A uranium-235 bomb was dropped on Hiroshima, Japan, on August 6, 1945, 8:16 AM local time, and it exploded at an altitude of 1900 feet with an estimated yield of 12 kilotons. Another nuclear bomb, a plutonium device, was dropped on Nagasaki, Japan, on August 9, 1945, at 11:06 AM local time, and exploded at an altitude of 1650 feet with an estimated yield of 22 kilotons.
The total energy released by the four main events of the Krakatoa explosion in 1883 eruption was equivalent to 200 megatons of TNT. Hiroshima was 15 kilotons. This will help you visualize the unit of both.
The bomb dropped Hiroshima detonated in mid air above a bank in central Hiroshima.