核武器是指利用爆炸性核反应释放出的巨大能量对目标造成杀伤破坏作用的武器。爆炸性核反应是利用能自持快速进行的原子核裂变或聚变反应,瞬间释放出巨大能量产生的核反应爆炸而形成巨大杀伤破坏效应。核弹爆炸时,释放的能量比采用化学炸药的常规弹药大得多。1千克铀裂变释放的能量相当于2万吨TNT炸药爆炸时放出的能量。核武器按作战任务使用范围可分为战 A nuclear weapon is a weapon that uses the enormous energy released by an explosive nuclear reaction to kill or destroy a target. Explosive nuclear reaction is the use of self-sustaining rapid nuclear fission or fusion reaction, the instantaneous release of a huge energy generated nuclear explosion and the formation of a huge anti-destruction effect. When a nuclear bomb explodes, it releases much more energy than conventional ammunition that uses chemical explosives. The energy released by 1 kg of uranium fission is equivalent to the energy released by the explosion of 20,000 tons of TNT explosives. The use of nuclear weapons by the scope of operational mission can be divided into combat