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De - Pt| English Dictionary: hydrogen | by the DICT Development Group |
| 3 results for hydrogen | |
| From WordNet (r) 3.0 (2006) [wn]: | |
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| From Webster's Revised Unabridged Dictionary (1913) [web1913]: | |
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Hydrogen \Hy"dro*gen\, n. [Hydro-, 1 + -gen: cf. F. hydrog[8a]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. | |
| From The Elements (22Oct97) [elements]: | |
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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. | |
