Crossword clues for hydrogen
Longman Dictionary of Contemporary English
The Collaborative International Dictionary
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.
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.
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.
Douglas Harper's Etymology Dictionary
1791, from French hydrogène, coined 1787 by G. de Morveau, Lavoisier, Berthollet, and Fourcroy from Greek hydr-, stem of hydor "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.
n. 1 The lightest chemical element (''symbol'' H) with an atomic number of 1 and atomic weight of 1.00794. 2 Molecular hydrogen (H2), a colourless, odourless and flammable gas at room temperature. 3 An atom of the element. 4 A sample of the element.
n. 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 [syn: H, atomic number 1]
Hydrogen is an open source drum machine created by Alessandro Cominu, an Italian programmer who goes by the pseudonym Comix. Its main goal is to provide professional yet simple and intuitive pattern-based drum programming.
Hydrogen was originally developed for Linux, but later ported to Mac OS X. Support for Microsoft Windows seemed to have been abandoned, since the last build dated to 2006 for 4 years. However, a Windows port exists since the 0.9.6 version, and it is now in beta stage. The graphical user interface for the application uses Qt library, and all code is released under the GNU General Public License.
Hydrogen is a chemical element.
Hydrogen may also refer to:
- Hydrogen atom
- Hydrogen ion
- Hydrogen (software), drum machine software
- Hydrogen vehicle
Isotopes of hydrogen
- Hydrogen-2 (deuterium)
- Hydrogen-3 (tritium)
Hydrogen is a chemical element with chemical symbol H and atomic number 1. With an atomic weight of , hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Non- remnant stars are mainly composed of hydrogen in the plasma state. The most common isotope of hydrogen, termed protium (name rarely used, symbol H), has one proton and no neutrons.
The universal emergence of atomic hydrogen first occurred during the recombination epoch. At standard temperature and pressure, hydrogen is a colorless, odorless, tasteless, non-toxic, nonmetallic, highly combustible diatomic gas with the molecular formula H. Since hydrogen readily forms covalent compounds with most non-metallic elements, most of the hydrogen on Earth exists in molecular forms such as water or organic compounds. Hydrogen plays a particularly important role in acid–base reactions because most acid-base reactions involve the exchange of protons between soluble molecules. In ionic compounds, hydrogen can take the form of a negative charge (i.e., anion) when it is known as a hydride, or as a positively charged (i.e., cation) species denoted by the symbol H. The hydrogen cation is written as though composed of a bare proton, but in reality, hydrogen cations in ionic compounds are always more complex. As the only neutral atom for which the Schrödinger equation can be solved analytically, study of the energetics and bonding of the hydrogen atom has played a key role in the development of quantum mechanics.
Hydrogen gas was first artificially produced in the early 16th century by the reaction of acids on metals. In 1766–81, Henry Cavendish was the first to recognize that hydrogen gas was a discrete substance, and that it produces water when burned, the property for which it was later named: in Greek, hydrogen means "water-former".
Industrial production is mainly from steam reforming natural gas, and less often from more energy-intensive methods such as the electrolysis of water. Most hydrogen is used near the site of its production site, the two largest uses being fossil fuel processing (e.g., hydrocracking) and ammonia production, mostly for the fertilizer market. Hydrogen is a concern in metallurgy as it can embrittle many metals, complicating the design of pipelines and storage tanks.
By the imported stallion Delville Wood (who also sired Melbourne Cup winner Evening Peal) he was foaled in 1948 and was trained throughout his career by Ted Hush.
Hydrogen failed by a neck of being the first horse to win three Cox Plates when beaten in 1951 as a three-year-old. He won the subsequent two editions of the race in 1952 and 1953.
An outstanding three-year-old he developed into one of Australia’s finest weight-for-age performers and the highest stakes earner at the time eclipsing the record previously held by Phar Lap.
A winner over six furlongs (1,200m) to two miles (3,200m) he won many major races including the 1951 VATC Caulfield Guineas, 1951 VRC Victoria Derby, 1951 STC Rosehill Guineas, 1951 AJC Craven Plate, the 1952 and 1953 MVRC W.S. Cox Plate, 1953 VRC LKS Mackinnon Stakes and the 1953 QTC Brisbane Cup.
He was retired to stud in 1954.
Usage examples of "hydrogen".
After passing through the catalytic reactors, the rare hydrogen allotrope was siphoned off, while the waste gases spilled back out from the hot stacks.
Railgun launchers shot barrels of pure hydrogen ice up to a drifting ekti reactor that would catalyze the hydrogen into ekti, the valuable allotrope used as stardrive fuel.
Through catalysts and convoluted magnetic fields, the reactors converted ultrapure hydrogen into an exotic allotrope of hydrogen.
Ekti was the only known allotrope of hydrogen, though other elements had varying molecular forms.
The scoops and reactors had operated continuously for dozens of centuries, producing the hydrogen allotrope, though in recent years, it was only a token amount.
Its industrial systems were outdated and inefficient by now, but processing of the hydrogen allotrope continued.
Anyway, copious quantities of hydrogen gas were pouring from the shaft maw, coming from the rent where the unfortunate brown man had fallen into a ballonet and suffocated.
Vents on the upper surface of the ship were opening, releasing hot air from the ballonets that hung in the center of the hydrogen cells.
Margo trimmed their attitude by adjusting the amount of ordinary air contained in ballonets inside the hydrogen bag.
She felt light, as if the hydrogen in the ballonets had filled her as well.
Their own supply of breathing hydrogen, while not yet critically low, is causing them and the distant Benj more and more concern.
Treat this with excess of bisulphate of sodium, then saturate with sulphuretted hydrogen until metals are thrown down as sulphides.
This was out of respect for the human nose, for from the Diaboli, slightly so as they breathed, much more so when they spoke, there came the gentle and continuous drift of hydrogen sulfide.
Removed by oxidation of all the the hydrogen organs of of proteids, excretion, carbohydrates, but in the and fats.
May 6, 1937, in Lakehurst, New Jersey, when its hydrogen fuel burst explosively into flame, killing thirty-six people.