NUCLEAR WEAPON:

The most destructive weapon that mankind would never want to imagine.A nuclear weapon is an explosive device that derives its destructive force from the nuclear reaction of fission or from a combination of fission and fusion. Both reactions release vast quantities of energy from relatively small amounts of matter; a modern thermonuclear weapon weighing little more than a ton can produce an explosion comparable to the detonation of more than a billion kilograms of conventional high explosive. Even small nuclear devices with yields equivalent to only a few thousand tons of TNT can devastate a city. Nuclear weapons are considered weapons of mass destruction.