Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Hydrogen> ?p ?o }
- Hydrogen abstract "Hydrogen is a chemical element with chemical symbol H and atomic number 1. With an atomic weight of 7000100794000000000♠1.00794 u, 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 its plasma state. The most common isotope of hydrogen, termed protium (name rarely used, symbol 1H), 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 H2. Since hydrogen readily forms covalent compounds with most non-metallic elements, most of the hydrogen on Earth exists in molecular forms such as in the form of water or organic compounds. Hydrogen plays a particularly important role in acid–base reactions as many 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 species than that would suggest. 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, via the mixing of metals with acids. In 1766–81, Henry Cavendish was the first to recognize that hydrogen gas was a discrete substance, and that it produces water when burned, a property which later gave it its name: in Greek, hydrogen means "water-former".Industrial production is mainly from the steam reforming of natural gas, and less often from more energy-intensive hydrogen production methods like the electrolysis of water. Most hydrogen is employed near its production site, with 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.".
- Hydrogen thumbnail Shuttle_Main_Engine_Test_Firing_cropped_edited_and_reduced.jpg?width=300.
- Hydrogen wikiPageExternalLink c3.
- Hydrogen wikiPageExternalLink node5.html.
- Hydrogen wikiPageExternalLink 001.htm.
- Hydrogen wikiPageExternalLink hydrofin.
- Hydrogen wikiPageID "13255".
- Hydrogen wikiPageLength "81039".
- Hydrogen wikiPageOutDegree "427".
- Hydrogen wikiPageRevisionID "683593687".
- Hydrogen wikiPageWikiLink 2001_Mars_Odyssey.
- Hydrogen wikiPageWikiLink Abundance_of_the_chemical_elements.
- Hydrogen wikiPageWikiLink Acid.
- Hydrogen wikiPageWikiLink Acid–base_reaction.
- Hydrogen wikiPageWikiLink Activated_carbon.
- Hydrogen wikiPageWikiLink Airship.
- Hydrogen wikiPageWikiLink Algae.
- Hydrogen wikiPageWikiLink Alloy_steel.
- Hydrogen wikiPageWikiLink Alumina.
- Hydrogen wikiPageWikiLink Aluminium.
- Hydrogen wikiPageWikiLink Aluminium_oxide.
- Hydrogen wikiPageWikiLink Ammonia.
- Hydrogen wikiPageWikiLink Ammonia_production.
- Hydrogen wikiPageWikiLink Amorphous_carbon.
- Hydrogen wikiPageWikiLink Amorphous_metal.
- Hydrogen wikiPageWikiLink Amorphous_silicon.
- Hydrogen wikiPageWikiLink Anaerobic_corrosion.
- Hydrogen wikiPageWikiLink Angular_momentum.
- Hydrogen wikiPageWikiLink Anion.
- Hydrogen wikiPageWikiLink Anode.
- Hydrogen wikiPageWikiLink Anoxic_waters.
- Hydrogen wikiPageWikiLink Antihydrogen.
- Hydrogen wikiPageWikiLink Antimatter.
- Hydrogen wikiPageWikiLink Antiproton.
- Hydrogen wikiPageWikiLink Antoine_Lavoisier.
- Hydrogen wikiPageWikiLink Asphyxia.
- Hydrogen wikiPageWikiLink Atmospheric_escape.
- Hydrogen wikiPageWikiLink Atom.
- Hydrogen wikiPageWikiLink Atomic_hydrogen_welding.
- Hydrogen wikiPageWikiLink Atomic_mass_unit.
- Hydrogen wikiPageWikiLink Atomic_nucleus.
- Hydrogen wikiPageWikiLink Atomic_number.
- Hydrogen wikiPageWikiLink Atomic_orbital.
- Hydrogen wikiPageWikiLink Atomic_weight.
- Hydrogen wikiPageWikiLink Aurora.
- Hydrogen wikiPageWikiLink Aurora_(phenomenon).
- Hydrogen wikiPageWikiLink Autoignition_temperature.
- Hydrogen wikiPageWikiLink Balloon.
- Hydrogen wikiPageWikiLink Baryon.
- Hydrogen wikiPageWikiLink Beta_decay.
- Hydrogen wikiPageWikiLink Beta_particle.
- Hydrogen wikiPageWikiLink Beta_radiation.
- Hydrogen wikiPageWikiLink Big_Bang.
- Hydrogen wikiPageWikiLink Biochemistry.
- Hydrogen wikiPageWikiLink Biological_hydrogen_production_(Algae).
- Hydrogen wikiPageWikiLink Birkeland_current.
- Hydrogen wikiPageWikiLink Bohr_model.
- Hydrogen wikiPageWikiLink Borane.
- Hydrogen wikiPageWikiLink Boron.
- Hydrogen wikiPageWikiLink Boron_group.
- Hydrogen wikiPageWikiLink Bridging_ligand.
- Hydrogen wikiPageWikiLink Brine.
- Hydrogen wikiPageWikiLink Bronsted-Lowry_theory.
- Hydrogen wikiPageWikiLink Brønsted–Lowry_acid–base_theory.
- Hydrogen wikiPageWikiLink CANDU_reactor.
- Hydrogen wikiPageWikiLink CNO_cycle.
- Hydrogen wikiPageWikiLink CO2_sequestration.
- Hydrogen wikiPageWikiLink Cadmium_oxide.
- Hydrogen wikiPageWikiLink Carbon.
- Hydrogen wikiPageWikiLink Carbon_capture_and_storage.
- Hydrogen wikiPageWikiLink Carbon_dioxide.
- Hydrogen wikiPageWikiLink Carbon_monoxide.
- Hydrogen wikiPageWikiLink Carbon_sequestration.
- Hydrogen wikiPageWikiLink Carborane.
- Hydrogen wikiPageWikiLink Catalysis.
- Hydrogen wikiPageWikiLink Catalyst.
- Hydrogen wikiPageWikiLink Category:Airship_technology.
- Hydrogen wikiPageWikiLink Category:Biology_and_pharmacology_of_chemical_elements.
- Hydrogen wikiPageWikiLink Category:Chemical_elements.
- Hydrogen wikiPageWikiLink Category:Diatomic_nonmetals.
- Hydrogen wikiPageWikiLink Category:Gaseous_signaling_molecules.
- Hydrogen wikiPageWikiLink Category:Hydrogen.
- Hydrogen wikiPageWikiLink Category:Hydrogen_compounds.
- Hydrogen wikiPageWikiLink Category:Nuclear_fusion_fuels.
- Hydrogen wikiPageWikiLink Category:Reducing_agents.
- Hydrogen wikiPageWikiLink Category:Refrigerants.
- Hydrogen wikiPageWikiLink Cathode.
- Hydrogen wikiPageWikiLink Cation.
- Hydrogen wikiPageWikiLink Cerium(IV)_oxide–cerium(III)_oxide_cycle.
- Hydrogen wikiPageWikiLink Chemical_bond.
- Hydrogen wikiPageWikiLink Chemical_compound.
- Hydrogen wikiPageWikiLink Chemical_element.
- Hydrogen wikiPageWikiLink Chemical_formula.
- Hydrogen wikiPageWikiLink Chemical_nomenclature.
- Hydrogen wikiPageWikiLink Chemical_reaction.
- Hydrogen wikiPageWikiLink Chemical_species.
- Hydrogen wikiPageWikiLink Chemical_symbol.
- Hydrogen wikiPageWikiLink Chlamydomonas_reinhardtii.
- Hydrogen wikiPageWikiLink Chlorine.
- Hydrogen wikiPageWikiLink Chloroplast.