Hydrogen Hydrogen Antihydrogen is the antimatter counterpart of hydrogen. ...more on Wikipedia about "Antihydrogen"
Hydrogen ( Latin: hydrogenium, from Greek: hydro: water, genes: forming) is a chemical element in the periodic table that has the symbol H and atomic number 1. At standard temperature and pressure it is a colorless, odorless, nonmetallic, univalent, tasteless, highly flammable diatomic gas. Hydrogen is the lightest and most abundant element in the universe. It is present in water, all organic compounds (rare exceptions exist, such as buckminsterfullerene) and in all living organisms. Hydrogen is able to react chemically with most other elements. Stars in their main sequence are overwhelmingly composed of hydrogen in its plasma state. The element is used in ammonia production, as a lifting gas, as an alternative fuel, and more recently as a power source of fuel cells. ...more on Wikipedia about "Hydrogen"
A hydrogen atom is an atom of the element hydrogen. It is composed of a single negatively-charged electron, attending a positively-charged proton which is the nucleus of the hydrogen atom. The electron is bound to the proton by the Coulomb force. ...more on Wikipedia about "Hydrogen atom"
In chemistry, a hydrogen bond is a type of attractive intermolecular force that exists between two partial electric charges of opposite polarity. Although stronger than most other intermolecular forces, the typical hydrogen bond is much weaker than both the ionic bond and the covalent bond. Within macromolecules such as proteins and nucleic acids, it can exist between two parts of the same molecule, and figures as an important constraint on such molecules' overall shape. ...more on Wikipedia about "Hydrogen bond"
Hydrogen is one of the constituents of water. It recycles as in other biogeochemical cycles. It is actively involved with the other cycles like the carbon cycle, nitrogen cycle and sulfur cycle as well. ...more on Wikipedia about "Hydrogen cycle"
A hydrogen economy is a hypothetical future economy in which the primary form of stored energy for mobile applications and load balancing is hydrogen (H2). In particular hydrogen is proposed as a fuel to replace the gasoline and diesel fuels currently used in automobiles. ...more on Wikipedia about "Hydrogen economy"
The hydrogen line refers to the spectral line created by changes in the energy state of neutral hydrogen and occurs at 1420.40575 MHz, or a wavelength of around 21 cm. The line is used extensively in astronomy, particularly radio astronomy. ...more on Wikipedia about "Hydrogen line"
(Hydrogen spectral series) where n is the initial energy level and n is the final energy level, and R is the Rydberg constant. ...more on Wikipedia about "Hydrogen spectral series"
A hydrogen car is an automobile which uses hydrogen as its primary source of power for locomotion. These cars generally use the hydrogen in one of two methods: combustion or fuel-cell conversion. In combustion, the hydrogen is "burned" in engines in fundamentally the same method as traditional gasoline cars. In fuel-cell conversion, the hydrogen is turned into electricity through fuel cells which then powers electric motors. With either method, the only byproduct from the spent hydrogen is water. ...more on Wikipedia about "Hydrogen vehicle"
Liquid hydrogen is a common liquid rocket fuel for rocket applications. In the aerospace industry, its name is often abbreviated to LH2. Hydrogen is found naturally in the molecular H2 form, thus the H2 part of the name. Hydrogen at normal temperature and pressure is a gas and to exist as a liquid must be pressurised and cooled to a very low temperature, 20.268 K (−423.188 °F). Once liquified it can be maintained as a liquid in pressurised and thermally insulated containers. ...more on Wikipedia about "Liquid hydrogen"
Photohydrogen is hydrogen produced with the help of artificial or natural light ( Photolysis). This is how the leaf of a tree splits water molecules into hydrogen (to make carbohydrates) and oxygen (released into the air for us to breathe) . Photohydrogen may also be produced by the photodissociation of water by ultraviolet light. Photohydrogen is sometimes discussed in the context of obtaining renewable energy from sunlight, by using microscopic organisms such as bacteria or algae. ...more on Wikipedia about "Photohydrogen"
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