H-bomb

hydrogen bomb, enormously destructive nuclear weapon based on the sudden release of atomic energy

A nuclear weapon derives its destructive force from nuclear reactions of fusion or fission. As a result, even a nuclear weapon with a small yield is significantly more powerful than the largest conventional explosives, and a single weapon is capable of destroying an entire city.In the history of warfare, two nuclear weapons have been detonated — both by the United States, during the closing days of World War II. The first event occurred on the morning of 6 August 1945, when the United States dropped a uranium gun-type device code-named "Little Boy" on the Japanese city of Hiroshima. The second event occurred three days later when the United States dropped a plutonium implosion-type device code-named "Fat Man" on the city of Nagasaki. These bombings resulted in the immediate deaths of around 120,000 people and even more over time because of injuries sustained and long-term radiation. The use of these weapons was and remains controversial. (See Atomic bombings of Hiroshima and Nagasaki for a full discussion).
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The Teller–Ulam design is a nuclear weapon design which is used in megaton-range thermonuclear weapons, and is more colloquially referred to as "the secret of the hydrogen bomb". It is named after two of its chief contributors, Hungarian born physicist Edward Teller and Polish born mathematician Stanisław Ulam, who developed the design in 1951. The idea is thought to pertain specifically to the use of a fission bomb "trigger" placed near an amount of fusion fuel, known as "staging", and the use of "radiation implosion" to compress the fusion fuel before igniting it. There are a number of other additions and variations to this idea posited by different sources.
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Noun
1. a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium
(synonym) hydrogen bomb, fusion bomb, thermonuclear bomb
(hypernym) nuclear weapon

n. h bomb, thermonuclear bomb

h-bomb /'eitʃbɔm/
danh từ bom hyddro, bom khinh khí
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