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. [1913 Webster]

Note: Although a gas, hydrogen is chemically similar to the metals in its nature, having the properties of a weak base. It is, in all acids, the base which is replaced by metals and basic radicals to form salts. Like all other gases, it is condensed by great cold and pressure to a liquid which freezes and solidifies by its own evaporation. It is absorbed in large quantities by certain metals (esp. palladium), forming alloy-like compounds; hence, in view of quasi-metallic nature, it is sometimes called {hydrogenium}. It is the typical reducing agent, as opposed to oxidizers, as oxygen, chlorine, etc. [1913 Webster]

{Bicarbureted hydrogen}, an old name for ethylene.

{Carbureted hydrogen gas}. See under {Carbureted}.

{Hydrogen dioxide}, a thick, colorless liquid, {H2O2}, resembling water, but having a bitter, sour taste, produced by the action of acids on barium peroxide. It decomposes into water and oxygen, and is manufactured in large quantities for an oxidizing and bleaching agent. Called also {oxygenated water}.

{Hydrogen oxide}, a chemical name for water, H?O.

{Hydrogen sulphide}, a colorless inflammable gas, {H2S}, having the characteristic odor of bad eggs, and found in many mineral springs. It is produced by the action of acids on metallic sulphides, and is an important chemical reagent. Called also {sulphureted hydrogen}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • H2S — may refer to: * Hydrogen sulfide (H2S), a chemical compound that smells like rotten eggs * H2S radar, the first airborne ground mapping radar used during World War II …   Wikipedia

  • H2S — bezeichnet: H2S, die chemische Formel für Schwefelwasserstoff ein britisches Radar, das im Zweiten Weltkrieg in Bombern zur Zielfindung eingesetzt wurde; siehe H2S (Navigation) einen Film von Roberto Faenza von 1968 …   Deutsch Wikipedia

  • H2S — Sulfure d hydrogène Sulfure d hydrogène Structure Général Nom IUPAC Sulfure d hydrogène …   Wikipédia en Français

  • H2S — …   Википедия

  • H2S — Schwefelwasserstoff; Wasserstoffsulfid; Hydrogensulfid …   Universal-Lexikon

  • H2S — Here To Stay …   Glossary of chat acronyms & text shorthand

  • H2S —   hydrogen sulfide …   Energy terms

  • H2S — • hydrogen sulphide …   Maritime acronyms and abbreviations

  • H2S radar — The H2S radar was used in bombers of RAF Bomber Command. It was designed to identify targets on the ground for night and all weather bombing. The transmitter/receiver equipment was officially known as TR3159 (H2S Mk I/ASV VIB) or TR3191 (H2S Mk… …   Wikipedia

  • H2S-Radar — Das H2S war ein Radarsystem, das in Bombern der britischen Royal Air Force eingesetzt wurde. Es diente der Zielfindung unter schlechten Sichtbedingungen, wie schlechtem Wetter und bei Nachteinsätzen. Am 30. Januar 1943 wurde das H2S erstmals in… …   Deutsch Wikipedia

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