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hydrogen vs. atomic bomb

[ hahy-druh-juhn ]
  1. a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements. Symbol: H; atomic weight: 1.00797; atomic number: 1; density: 0.0899 grams/liter at 0°C and 760 millimeters pressure.
[ uh-tom-ik bom ]
  1. a bomb whose potency is derived from nuclear fission of atoms of fissionable material with the consequent conversion of part of their mass into energy.
  2. a bomb whose explosive force comes from a chain reaction based on nuclear fission in U-235 or plutonium.

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