n.1.(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.
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.<- usually "hydrogen peroxide", or "peroxide" in weak solutions used as an antiseptic->
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.
Noun1.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 universe
Synonyms: atomic number 1, H
atomic number 1, chemical element, element, gas, H, H2O, hydrogenate, tritium, water
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hydroelectric turbine
hydrofluoric acid
hydrofluosilicic acid
-- Hydrogen --
hydrogen atom
hydrogen azide
hydrogen bomb
hydrogen bond
Hydrogen Breath Test
hydrogen bromide
hydrogen carbonate
hydrogen chloride
hydrogen cyanide
Hydrogen dioxide
hydrogen fluoride
hydrogen iodide
hydrogen ion
hydrogen ion concentration
Hydrogen oxide
hydrogen peroxide
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