A nuclear weapon is a device designed to release energy in an explosive manner as a result of nuclear fission, nuclear fusion, or a combination of the two. Fission weapons are commonly referred to as atomic bombs, and fusion weapons are referred to as th
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the atomic bomb dropped onHiroshima,Japan, in 1945, containing only about 64 kg (140 pounds) of highly enricheduranium, released energy equaling about 15 kilotons of chemical explosive. That blast immediately produced a strongshock wave, enormous amounts of heat, and lethalionizing radiation. Con...