Nuclear fission can be used to generate large amounts of energy for destructive purposes. When an atom of 235U is bombarded by a neutron it releases a large amount of energy. If additional neutrons are not controlled they can cause a chain reaction which could result in a nuclear explosion (A-bomb). Only a small amount of uranium, about the size of a baseball, is needed to produce an explosion as powerful as 20 kilotons of TNT.
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