hydrogen

hy·dro·gen  (hdr-jn)

n. Symbol H

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

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hy·droge·nous (-drj-ns) adj.

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hydrogen

Noun

Chem a colourless gas that burns easily and is the lightest element in the universe. It occurs in water and in most organic compounds Symbol: H[hydro- + -gen (producing); because its combustion produces water]

hydrogenous adj

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hydrogen  (hdr-jn)

Symbol H

The lightest and most abundant element in the universe, normally consisting of one proton and one electron. It occurs in water in combination with oxygen, in most organic compounds, and in small amounts in the atmosphere as a gaseous mixture of its three isotopes (protium, deuterium, and tritium) in the colorless, odorless compound H₂. Hydrogen atoms are relatively electropositive and form hydrogen bonds with electronegative atoms. In the Sun and other stars, the conversion of hydrogen into helium by nuclear fusion produces heat and light. Hydrogen is used to make rocket fuel, synthetic ammonia, and methanol, to hydrogenate fats and oils, and to refine petroleum. The development of physical theories of electron orbitals in hydrogen was important in the development of quantum mechanics. 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 Periodic Table. See Note at oxygen.

Thesaurus

Noun

1.

hydrogen - 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 atomic number 1, H tritium - a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter H2O, water - binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent gas - a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely

Translations

hydrogen [ˈhaɪdrədʒən] n → hidrógeno

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hydrogen [ˈhaɪdrədʒən] n → hydrogène m

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hydrogen [ˈhaɪdrədʒən] n → Wasserstoff m

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hydrogen [ˈhaɪdrədʒən] n → idrogeno