You searched for: “hydrogen
1. A colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known chemical elements.
2. A colorless, highly flammable gaseous element, the lightest of all gases and the most abundant element in the universe, used in the production of synthetic ammonia and methanol, in petroleum refining, in the hydrogenation of organic materials, as a reducing atmosphere, in oxyhydrogen torches, and in rocket fuels.
3. From 1791, French hydrogène, coined in 1787 by G. de Morveau from Greek hydr-, stem of hydros, "water" + French -gène, "producing". So called because it forms water when exposed to oxygen.

Source: water, most organic compounds. Use: industrial processes, production of ammonia, reduction of metal ores to metals.

This entry is located in the following unit: hydro-, hydra-, hydr-, hyd- (page 6)
Information is located at Chemical Element: hydrogen.
This entry is located in the following unit: Chemical Elements List (page 3)
More possibly related word entries
A unit related to: “hydrogen
(Greek: hydor, "water", plus gen, "born", "forming"; gas)
Word Entries containing the term: “hydrogen
hydrogen electrode
An electrode that absorbs hydrogen gas; used in pH measurement.
This entry is located in the following unit: electro-, electr-, electri- (page 93)
hydrogen ion
The nucleus of a hydrogen atom separated from its accompanying electron.

The hydrogen nucleus is made up of a particle carrying a unit positive electric charge, called a proton.

Because the bare nucleus can readily combine with other particles (electrons, atoms, and molecules), the isolated hydrogen ion can exist only in a nearly particle-free space (high vacuum) and in the gaseous state.

In common usage, the term hydrogen ion is used to refer to the hydrogen ion present in water solutions, in which it exists as the combined molecule H + H2O.

The amount of hydrogen ion present in a water solution is used as a measure of the acidity of a substance; the higher the concentration of hydrogen ion the more acidic the solution and the lower the pH.

—Compiled from "hydrogen ion", Encyclopædia Britannica; 2010;
Encyclopædia Britannica Online; May 22, 2010.
This entry is located in the following unit: ion, ion- + (page 1)
solar-hydrogen economy
An economy in which direct solar energy would be the primary energy source and hydrogen the secondary energy carrier.

Power from wind or photovoltaic systems would drive photo-electrolytic hydrogen production.

This entry is located in the following unit: sol-, soli-, solo- + (page 5)
Word Entries at Get Words: “hydrogen
A light, invisible, and highly flammable gas that can be used to make power in a fuel cell.
This entry is located in the following unit: Automobile or Related Car Terms (page 4)