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hydrogen
hy·dro·gen H0344800 (hī′drə-jən)n. Symbol H A colorless, highly flammable element, that occurs as a diatomic molecule, H2, 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, in cryogenic research, and in rocket fuels. Atomic number 1; atomic weight 1.00794; melting point -259.1°C; boiling point -252.8°C; density at 0°C 0.08988 gram per liter; valence 1. See Periodic Table.
[French hydrogène : Greek hudro-, hydro- + French -gène, -gen.]
hy·drog′e·nous (-drōj′ə-nəs) adj.hydrogen (ˈhaɪdrɪdʒən) n (Elements & Compounds) a. a flammable colourless gas that is the lightest and most abundant element in the universe. It occurs mainly in water and in most organic compounds and is used in the production of ammonia and other chemicals, in the hydrogenation of fats and oils, and in welding. Symbol: H; atomic no: 1; atomic wt: 1.00794; valency: 1; density: 0.08988 kg/m3; melting pt: –259.34°C; boiling pt: –252.87°C. See also deuterium, tritiumb. (as modifier): hydrogen bomb. [C18: from French hydrogène, from hydro- + -gen; so called because its combustion produces water]hy•dro•gen (ˈhaɪ drə dʒən)
n. a colorless, odorless, flammable gas, the lightest of the elements, that combines chemically with oxygen to form water. Symbol: H; at. wt.: 1.00797; at. no.: 1; density: 0.0899 g/l at 0°C and 760 mm pressure. [< French hydrogène (1787); see hydro-1, -gen] hy·dro·gen (hī′drə-jən) Symbol H A colorless, odorless, highly flammable gaseous element that is the lightest and most abundant element in the universe. 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 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. Atomic number 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 universeatomic number 1, Htritium - a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atomschemical 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 matterH2O, 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 solventgas - a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely |
Translationshydrogen (ˈhaidrədʒən) noun an element, the lightest gas, which burns and which, when combined with oxygen, produces water. 氫 氢hydrogen bomb (ˈeitʃbom) (also H-bomb ) a very powerful bomb in which the explosion is caused by turning hydrogen into helium at a very high temperature. 氫彈 氢弹hydrogen
hydrogen (H) [hi´dro-jen] a chemical element, atomic number 1, atomic weight 1.00797. (See Appendix 6.) It exists as the mass 1 isotope (protium, or light or ordinary hydrogen), mass 2 isotope (deuterium, heavy hydrogen), and mass 3 isotope (tritium).hydrogen cyanide an extremely poisonous colorless liquid or gas, HCN, a decomposition product of various naturally occurring glycosides and a common cause of cyanide poisoning. Inhalation of the gas can cause death within a minute. Called also hydrocyanic acid.heavy hydrogen deuterium.hydrogen ion concentration the degree of concentration of hydrogen ions (the acid element) in a solution. Its symbol is pH, and it expresses the degree to which a solution is acidic or alkaline. The pH range extends from 0 to 14, pH 7 being neutral, a pH of less than 7 indicating acidity, and one above 7 indicating alkalinity. See also acid-base balance.hydrogen peroxide H2O2, an antiseptic with a mildly antibacterial action. A 3 per cent solution foams on touching skin or mucous membrane and appears to have a mechanical cleansing action.hydrogen sulfide H2S, a poisonous gas with an offensive smell, released from decaying organic material, natural gas, petroleum, and sulfur deposits, and sometimes used as a chemical reagent.hy·dro·gen (H), (hī'drō-jen), 1. A gaseous element, atomic no. 1, atomic wt. 1.00794. 2. The molecular form (H2) of the element. Synonym(s): dihydrogen [hydro- + G. -gen, producing] hy·dro·gen (H) (hī'drō-jen) 1. A gaseous element, atomic no. 1, atomic wt. 1.00794. 2. The molecular form of the element, H2.
Synonym(s): dihydrogen. [hydro- + G. -gen, producing]HydrogenThe simplest, most common element known in the universe. It is composed of a single electron (negatively charged particle) circling a nucleus consisting of a single proton (positively charged particle). It is the nuclear proton of hydrogen that makes MRI possible by reacting resonantly to radio waves while aligned in a magnetic field.Mentioned in: Magnetic Resonance Imaginghy·dro·gen (hī'drō-jen) 1. Gaseous element, atomic no. 1, atomic wt. 1.00794. 2. Molecular form (H2) of the element. [hydro- + G. -gen, producing]FinancialSeeHSee HYDR
See HYDRhydrogen
Related to hydrogen: Hydrogen fuel cellSynonyms for hydrogennoun a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gasSynonymsRelated Words- tritium
- chemical element
- element
- H2O
- water
- gas
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