Fusion Bomb
A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either nuclear fission (fission or atomic bomb) or a combination of fission and nuclear fusion reactions (thermonuclear weapon), producing a nuclear explosion. Both bomb types release large quantities of energy from relatively small amounts of matter. Nine sovereign states are believed to possess nuclear weapons as of 2026: United States, Russia, the United Kingdom, France, China, India, Pakistan, North Korea, and Israel.
The majority of current nuclear weapons have energy yields between 100 and 1,000 kilotons of TNT. Yields in the low kilotons can destroy cities. The effects of nuclear weapons include extreme blast damage, heat, ionizing radiation, and firestorms, followed by radioactive nuclear fallout, an electromagnetic pulse, radar blackout, and acute or chronic radiation syndrome in humans and animals. Hundreds of nuclear explosions will likely cause nuclear winter and nuclear famine.
The first nuclear weapons were developed by the United States in collaboration with the United Kingdom and Canada during World War II in the Manhattan Project. Production requires a large scientific-industrial complex, primarily for fissile material, either nuclear reactors and reprocessing plants producing plutonium, or uranium enrichment facilities. Nuclear weapons have been used twice in war, in the 1945 atomic bombings of Hiroshima and Nagasaki that killed between 150,000 and 246,000 people. Nuclear deterrence, including mutually assured destruction, aims to prevent nuclear warfare via the threat of unacceptable damage and the danger of escalation to nuclear holocaust. A nuclear arms race for weapons and their delivery systems was a defining component of the Cold War. Nuclear weapons have had yields between 50 megatons for the Tsar Bomba, and 10 tons for the W54.
Strategic nuclear weapons are targeted against civilian, industrial, and military infrastructure, while tactical nuclear weapons are intended for battlefield use. Strategic weapons led to the development of dedicated intercontinental ballistic missiles, submarine-launched ballistic missile, and nuclear strategic bombers, collectively known as the nuclear triad. Tactical weapons options have included shorter-range ground-, air-, and sea-launched missiles, nuclear artillery, atomic demolition munitions, nuclear torpedoes, and nuclear depth charges, but they have become less salient since the end of the Cold War.
In addition to the states that possess nuclear weapons, nuclear weapons are deployed on the territory of six non-nuclear-weapon states under nuclear sharing arrangements. Roughly 40 countries have defense policies based on nuclear deterrence, including over 30 non-nuclear-weapon states under extended deterrence or nuclear umbrella agreements such as the North Atlantic Treaty Organization. Nuclear weapons are weapons of mass destruction, and their control is a focus of international security through measures to prevent nuclear proliferation, arms control, or nuclear disarmament. The total global stockpile peaked at over 64,000 weapons in 1986, and is around 9,600 today. Key international agreements and organizations include the Treaty on the Non-Proliferation of Nuclear Weapons, the Comprehensive Nuclear-Test-Ban Treaty and Organization, the International Atomic Energy Agency, nuclear-weapon-free zones, and the Treaty on the Prohibition of Nuclear Weapons.
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