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2. What is the difference between an atom bomb and a hydrogen (or thermonuclear) bomb?
An atom bomb splits a plutonium atom, whereas a hydrogen bomb splits a radioactive hydrogen isotope.
Atom bombs and hydrogen bombs both derive energy from splitting atoms, or fission, but hydrogen bombs then harness that energy to power nuclear fusion, creating larger explosions.
An atom bomb requires enriched uranium, whereas a hydrogen bomb can be produced from water – which makes the technology available to many more governments.