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hydrogen
  • n  a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
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hydrogen azide
  • n  a colorless explosive liquid that is volatile and poisonous and foul-smelling
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hydrogen bomb
  • n  a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium
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hydrogen bond
  • n  a chemical bond consisting of a hydrogen atom between two electronegative atoms (e.g., oxygen or nitrogen) with one side be a covalent bond and the other being an ionic bond
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hydrogen bromide
  • n  a colorless gas that yields hydrobromic acid in solution with water
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hydrogen carbonate
  • n  a salt of carbonic acid (containing the anion HCO3) in which one hydrogen atom has been replaced; an acid carbonate
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hydrogen cyanide
  • n  a highly poisonous gas or volatile liquid that smells like bitter almonds; becomes a gas at around 90 degree Fahrenheit and is most dangerous when inhaled; the anhydride of hydrocyanic acid; used in manufacturing
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hydrogen fluoride
  • n  a colorless poisonous corrosive liquid made by the action of sulphuric acid on calcium fluoride; solutions in water are hydrofluoric acid
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hydrogen iodide
  • n  a colorless gas that yields hydroiodic acid in aqueous solution
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hydrogen ion
  • n  a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus
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hydrogen ion concentration
  • n  the number of moles of hydrogen ions per cubic decimeter
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hydrogen peroxide
  • n  a viscous liquid with strong oxidizing properties; a powerful bleaching agent; also used (in aqueous solutions) as a mild disinfectant and (in strong concentrations) as an oxidant in rocket fuels
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hydrogen sulfide
  • n  a sulfide having the unpleasant smell of rotten eggs
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hydrogenation
  • n  a chemical process that adds hydrogen atoms to an unsaturated oil
    food producers use hydrogenation to keep fat from becoming rancid
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