hydrogen

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The researchers have created a heat exchanger that circulates coolant through tubes and uses fins to remove heat generated as the hydrogen is absorbed by the powder.

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Definitions (31)

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  1. noun A colorless, highly flammable gaseous element, the lightest of all gases and the most abundant element in the universe, used in the production of synthetic ammonia and methanol, in petroleum refining, in the hydrogenation of organic materials, as a reducing atmosphere, in oxyhydrogen torches, and in rocket fuels. Atomic number 1; atomic weight 1.00794; melting point -259.14°C; boiling point -252.8°C; density at 0°C 0.08987 gram per liter; valence 1. See Table at element.

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Examples (50)

  • Although the discovery of the hydrogen was a hindrance to astronomers, it was a help to geophysicists. —  BEN BOVA Editor
  • Some cryogenic liquid hydrogen, which is Minus 423 degrees Fahrenheit, always "boils off" -- or changes to a gaseous state -- during propellant-loading operations.
  • The researchers have created the system's heat exchanger, which circulates coolant through tubes and uses fins to remove heat generated as the hydrogen is absorbed by the powder. —  Energy News - Energy Technology - Energy Business - Energy and the Environment
  • The researchers have created a heat exchanger that circulates coolant through tubes and uses fins to remove heat generated as the hydrogen is absorbed by the powder. —  Latest News - UPI.com
  • The generator uses a special borohydride solution which has a high capacity for storing hydrogen, which is used to create electricity. —  Find Free Articles - ArticlesBase
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Etymologies (2)

Toggle American Heritage etymologies American Heritage Dictionary (1)

  1. French hydrogène : Greek hudro-, hydro- + French -gène, -gen.

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  1. = French hydrogène = Spanish hidrógeno = Portuguese hydrogeneo, hydrogenio = Italian idrogeno, from New Latin hydrogenium, hydrogen (so called because it is one of the elements of water, H2O), from Greek υ%36δωρ (ὑδρ-), water, + -γενής, producing: see -gen.
 

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/ˈhaɪdrədʒɛn/
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