Fat Man (atomic bomb)
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FAT MAN was the code name for the second nuclear weapon used in the nuclear attacks against Japan during World War II. It was a plutonium implosion device, with an energy (science)energy yield of approximately 12 kilotons of TNT equivalent. It was air-dropped on Nagasaki, Japan on August 9, 1945.
An identical device had been exploded in the Trinity test in the United States, to confirm the technology actually worked.