Examples from the Web for hydrogen
From that, they extracted the ratio of the number of deuterium atoms to the number of hydrogen atoms.
They found that there are roughly 1,900 hydrogen atoms for each deuterium atom in the water on Comet 67P.
Deuterium is an isotope of hydrogen containing a proton and neutron in its nucleus, while normal hydrogen has only a proton.
Jupiter and its cousins, by contrast, are mostly made of hydrogen and hydrogen compounds.
Most of the atoms in a newborn star system are hydrogen, which is the lightest chemical element.
Thus hydrogen potassium or hydrogen sodium can be obtained, as will be seen by the following description.
Carbon, hydrogen, oxygen and nitrogen are all lifeless bodies.Lay Sermons, Addresses and Reviews|Thomas Henry Huxley
The mass of each particle is, according to the latest and finest measurements 1/1845 of that of an atom of hydrogen.The Outline of Science, Vol. 1 (of 4)|J. Arthur Thomson
Chlorine has a powerful affinity for bases of all kinds, particularly metallic bases and hydrogen.A System of Logic: Ratiocinative and Inductive|John Stuart Mill
In Fig. 12, why is it necessary to dry the hydrogen by means of the calcium chloride in the tube X?An Elementary Study of Chemistry|William McPherson
British Dictionary definitions for hydrogen
- 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°CSee also deuterium, tritium
- (as modifier)hydrogen bomb
Word Origin for hydrogen
Word Origin and History for hydrogen
1791, from French hydrogène, coined 1787 by G. de Morveau, Lavoisier, Berthollet, and Fourcroy from Greek hydr-, stem of hydros "water" (see water (n.1)) + French -gène "producing" (see -gen). So called because it forms water when exposed to oxygen. Nativized in Russian as vodorod; in German, it is wasserstoff, "water-stuff." An earlier name for it in English was Cavendish's inflammable air (1767). Hydrogen bomb first recorded 1947; shortened form H-bomb is from 1950.
Medicine definitions for hydrogen
n. Symbol H
Science definitions for hydrogen
Culture definitions for hydrogen
The lightest chemical element; its symbol is H. Hydrogen normally consists of a single electron in orbit around a nucleus made up of a single proton. It is usually found as a gas and has several uses as a fuel.