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Hydrogen - Dictionary Definition and Overview |
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Hydrogen : (noun)
1: 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
[syn: H, atomic number 1]
Based on WordNet 2.0
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Hydrogen : \Hy"dro*gen\, n. [Hydro-, 1 _ -gen: cf. F.
hydrog[`e]ne. So called because water is generated by its
combustion. See Hydra.] (Chem.)
A gaseous element, colorless, tasteless, and odorless, the
lightest known substance, being fourteen and a half times
lighter than air (hence its use in filling balloons), and
over eleven thousand times lighter than water. It is very
abundant, being an ingredient of water and of many other
substances, especially those of animal or vegetable origin.
It may by produced in many ways, but is chiefly obtained by
the action of acids (as sulphuric) on metals, as zinc, iron,
etc. It is very inflammable, and is an ingredient of coal gas
and water gas. It is standard of chemical equivalents or
combining weights, and also of valence, being the typical
monad. Symbol H. Atomic weight 1.
Based on Webster's Revised Unabridged Dictionary
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Hydrogen : Symbol: H
Atomic number: 1
Atomic weight: 1.0079
Colourless, odourless gaseous chemical element. Lightest and most
abundant element in the universe. Present in water and in all organic
compounds. Chemically reacts with most elements. Discovered by Henry
Cavendish in 1776.
Based on Elements database 20001107 [ELEM_Dictionary]:
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Hydrogen : Hydrogen: The most plentiful element in the universe and one present in all organic compounds. Hydrogen is a gas with an atomic number of 1 and the symbol H.
Two isotopes of hydrogen -- deuterium and tritium -- have been used as tracers in autoradiography in the laboratory.
Antoine Lavoisier coined the name hydrogen from the Greek hydro (water) _ genes (forming), reflecting the fact that water is generated by the combustion of this element.
Based on Elements database 20001107 [ELEM_Dictionary]:
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Example Usage of Hydrogen |
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kono_a: Hydrogen BluebackがWRとは粘着せざるを得ない。 |
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JonSHarvey: two Hydrogen atoms, one says "I think I've lost my electron". Other says "are you sure?". The other replies "I'm positive" |
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gasdieselprices: #74: Hydrogen Energy Gets Two Big Boosts | Alternative Energy ... http://bit.ly/7Q1otN |
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