What is hydrogen?

  • (noun): 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: H, atomic number 1


Hydrogen is a chemical element with symbol H and atomic number 1. With an average atomic weight of 1.00794 u (1.007825 u for hydrogen-1), hydrogen is the lightest element and its monatomic form (H1) is the most abundant chemical substance, constituting roughly 75% of the Universe's baryonic mass. Non-remnant stars are mainly composed of hydrogen in its plasma state.

Read more about Hydrogen.

Some articles on hydrogen:

Energy-Quest - Endorsements
... Organisations who officially endorse the Hydrogen Expedition Bluewater Network National Hydrogen Association of Australia Save the Planet USA Environment Colorado ...
Nascent Hydrogen - Uses of Atomic Hydrogen
... The atomic hydrogen torch uses it to generate very high temperatures near 4,000°C for welding ... Hydrogen is a powerful reducing agent which eliminates the need for flux to prevent oxidation of the weld ... Atomic hydrogen determines the frequency of hydrogen masers which are used as precise frequency standards ...
Hydrogen - Safety and Precautions
... Hydrogen poses a number of hazards to human safety, from potential detonations and fires when mixed with air to being an asphyxiant in its pure, oxygen-free form ... In addition, liquid hydrogen is a cryogen and presents dangers (such as frostbite) associated with very cold liquids ... Hydrogen dissolves in many metals, and, in addition to leaking out, may have adverse effects on them, such as hydrogen embrittlement, leading to cracks and explosions ...
Nascent Hydrogen
... Atomic hydrogen (or nascent hydrogen) consists of individual hydrogen atoms that are not bound together like those in ordinary hydrogen molecules ... species is denoted by H (atomic), contrasted with the usual H2 (dihydrogen or just 'hydrogen') commonly involved in chemical reactions ... According to one claim, nascent hydrogen is generated in situ usually by the reaction of zinc with an acid, aluminium (Devarda's alloy) with sodium hydroxide, or by electrolysis at the cathode ...
High-altitude Balloon - History - The First Hydrogen Balloon
... In France during 1783, the first public experiment with hydrogen-filled balloons involved Jacques Charles, a French professor of Physics and the Robert brothers, renowned ... Charles provided large quantities of hydrogen, which had only been produced in small quantities previously, by mixing 540 kg of iron and 270 kg of sulfuric acid ...

Famous quotes containing the word hydrogen:

    All you of Earth are idiots!... First was your firecracker, a harmless explosive. Then your hand grenade. They begin to kill your own people a few at a time. Then the bomb. Then a larger bomb, many people are killed at one time. Then your scientists stumbled upon the atom bomb—split the atom. Then the hydrogen bomb, where you actually explode the air itself.
    Edward D. Wood, Jr. (1922–1978)

    The pace of science forces the pace of technique. Theoretical physics forces atomic energy on us; the successful production of the fission bomb forces upon us the manufacture of the hydrogen bomb. We do not choose our problems, we do not choose our products; we are pushed, we are forced—by what? By a system which has no purpose and goal transcending it, and which makes man its appendix.
    Erich Fromm (1900–1980)