Isotopes of helium - Helium-3. For more details on this topic, see Helium-3. Isotopes of helium - Helium-4. For more details on this topic, see Helium-4. ...

See also:

Isotopes of helium, Isotopes of helium - Natural helium isotopes, Isotopes of helium - Helium-3, Isotopes of helium - Helium-4, Isotopes of helium - Exotic helium isotopes, Isotopes of helium - Table, Isotopes of helium - Notes

Read more here: » Isotopes of helium: Encyclopedia II - Isotopes of helium - Natural helium isotopes

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Helium, Helium - Notable characteristics, Helium - Gas and plasma phases, Helium - Solid and liquid phases, Helium - Electron energy levels, Helium - Applications, Helium - History, Helium - Discoveries, Helium - Production and use, Helium - Occurrence and production, Helium - Abundance, Helium - Production, Helium - Isotopes, Helium - Precautions

Read more here: » Helium: Encyclopedia II - Helium - Applications

Although there are eight known isotopes of helium, only helium-3 and helium-4 are stable. In the Earth's atmosphere, there is one He-3 atom for every million He-4. However, helium is unusual in that its isotopic abundance varies greatly depending on its origin. In the interstellar medium, the proportion of He-3 is around a hundred times higher. Rocks from the Earth's crust have isotope ratios varying by as much as a factor of ten; this is used in geology ...

See also:

Helium, Helium - Notable characteristics, Helium - Gas and plasma phases, Helium - Solid and liquid phases, Helium - Electron energy levels, Helium - Applications, Helium - History, Helium - Discoveries, Helium - Production and use, Helium - Occurrence and production, Helium - Abundance, Helium - Production, Helium - Isotopes, Helium - Precautions

Read more here: » Helium: Encyclopedia II - Helium - Isotopes

edit In cosmology, Big Bang nucleosynthesis (or primordial nucleosynthesis) refers to the production of nuclei other than H-1, the normal, light hydrogen, during the early phases of the universe, shortly after the Big Bang. It is believed to be responsible for the formation of hydrogen (H-1 or H), its isotope deuterium (H-2 or D), the helium isotopes He-3 and He-4, and the lithium isotope Li-7. Big Bang nucleosynthesis - Sequence of BBN. Big Bang nucleosynthesis begins about one ...

Including:

• Big Bang nucleosynthesis - Sequence of BBN
• Big Bang nucleosynthesis - History of Big Bang nucleosynthesis
• Big Bang nucleosynthesis - Heavy elements
• Big Bang nucleosynthesis - Helium-4
• Big Bang nucleosynthesis - Deuterium
• Big Bang nucleosynthesis - Status and Implications of BBN
• Big Bang nucleosynthesis - Non-standard BBN

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Air is the most common and only natural breathing gas. Other artificial gases, either pure gases or mixtures of gases, are used in enclosed breathing environments such as SCUBA equipment, recompression chambers, submarines, space suits and anaesthetic machines. A safe breathing gas has three essential features: it must contain sufficient oxygen to support the life, consciousness and work rate of the breather. it must not contain harmful gases. Carbon monoxide and carbon dioxide are common poisons in ...

Including:

• Breathing gas - Common diving breathing gases
• Breathing gas - Individual component gases
• Breathing gas - Oxygen
• Breathing gas - Nitrogen
• Breathing gas - Helium
• Breathing gas - Neon
• Breathing gas - Hydrogen
• Breathing gas - Unwelcome components of breathing gases
• Breathing gas - Argon
• Breathing gas - Carbon dioxide
• Breathing gas - Carbon monoxide
• Breathing gas - Hydrocarbons
• Breathing gas - Moisture content
• Breathing gas - Gas detection and measurement

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The helion is the nucleus of the helium-3 atom, one of the two stable isotopes of helium. The helion consists of two protons and one neutron. The nucleus of the helium-4 atom is called an alpha particle. According to CODATA, the mass of a helion particle is 5.006 412 14(86) × 10-27 kg. ...

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A balloon flight competition is a competition with which it counts to send balloon postal service over as greatly as possible distances, because the flight of the related balloon is not susceptible, the result, as far as all started balloons well with hydrogen or helium filled are – of the wind conditions and of the probability is that the balloon is found at that decline plotted, dependent. Other related archivesballoon, competition, helium, hydrogen

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The hypothesis of abiogenic petroleum origin (synonyms: abiotic, abyssal, endogenous, inorganic, juvenile, mineral, primordial) holds that petroleum is formed by non-biological processes deep in the earth's crust and mantle. It contradicts the more widely-held view that petroleum is a fossil fuel produced from the remains of ancient living organisms. The constituent precursors of petroleum (mainly methane) are commonplace and it is possible that appropriate conditions exist for hydrocarbons to be formed deep within the earth ...

Including:

• Abiogenic petroleum origin - Comparison of theories
• Abiogenic petroleum origin - Raw material
• Abiogenic petroleum origin - Events before conversion
• Abiogenic petroleum origin - Conversion to petroleum and methane
• Abiogenic petroleum origin - Formation of coal
• Abiogenic petroleum origin - Evidence supporting abiogenic theory
• Abiogenic petroleum origin - Supergiant oil fields
• Abiogenic petroleum origin - Extraterrestrial methane
• Abiogenic petroleum origin - Existence of hydrocarbon deposits
• Abiogenic petroleum origin - Methane on Earth
• Abiogenic petroleum origin - Cold planetary formation
• Abiogenic petroleum origin - Unusual deposits
• Abiogenic petroleum origin - Deep microbes
• Abiogenic petroleum origin - Helium
• Abiogenic petroleum origin - Trace metals
• Abiogenic petroleum origin - Diamondoids
• Abiogenic petroleum origin - Hydrogen
• Abiogenic petroleum origin - Thermodynamics
• Abiogenic petroleum origin - Biology
• Abiogenic petroleum origin - Serpentinization and chemical synthesis of oil
• Abiogenic petroleum origin - Deep structures and petroleum association
• Abiogenic petroleum origin - Why is oil frequently found in sedimentary basins?
• Abiogenic petroleum origin - Ambiguous results
• Abiogenic petroleum origin - Biomarkers or Chemofossils
• Abiogenic petroleum origin - Deep hot carbon sources
• Abiogenic petroleum origin - Evidence supporting biogenic theory
• Abiogenic petroleum origin - Unusual deposits
• Abiogenic petroleum origin - Biomarkers
• Abiogenic petroleum origin - Petroleum origin peak oil and politics
• Abiogenic petroleum origin - The future of the abiogenic theory

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The abundance of a chemical element measures how common the element is, or how much of the element there is. Abundance of the chemical elements - Abundance of elements in the Universe. Hydrogen is the most abundant element in the known Universe; helium is second. However, after this, the rank of abundance does not continue to correspond to the atomic number; oxygen has abundance rank 3, but atomic number 8. All others are orders of magnitude less common. Both helium-3 and helium-4 were produced in th ...

Including:

• Abundance of the chemical elements - Abundance of elements in the Universe
• Abundance of the chemical elements - Abundance of elements in the Solar System
• Abundance of the chemical elements - Abundance of elements in Earth
• Abundance of the chemical elements - Abundance of elements in Earth's crust
• Abundance of the chemical elements - Ocean
• Abundance of the chemical elements - Atmosphere
• Abundance of the chemical elements - Organisms
• Abundance of the chemical elements - Human body

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Nucleosynthesis Neutron Capture The R-process The S-process Proton capture: The P-process Alpha decay is a form of radioactive decay in which an atomic nucleus ejects an alpha particle and transforms into a nucleus with mass number 4 less and atomic number 2 less. For example: although this is usually written as: Note that an alpha particle is a helium nucleus, and that both mass number and ato ...

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The CNO (carbon-nitrogen-oxygen) cycle is one of two fusion reactions by which stars convert hydrogen to helium, the other being the proton-proton chain. While the proton-proton chain is more important in stars the size of the sun or less, theoretical models show that the CNO cycle is the dominant source of energy in heavier stars. The CNO process was proposed in 1938 by Hans Bethe. The reactions of the CNO cycle are: 12C + 1H → 13N + ...

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Yttrium barium copper oxide, or YBCO, chemical formula YBa2Cu3O7-δ, is a high-temperature superconductor with a superconducting temperature of 94K. Its discovery by The University of Alabama in Huntsville in 1987 launched the era of high-temperature superconductors. It was the first superconductor to break the liquid nitrogen barrier, i.e. the first to be superconducting at a temperature high enough to permit the use of liquid nitrogen as a coolant. Because liquid nitrogen, at 77K, is significantly less expensive than liquid helium, YBCO made a la ...

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A cryomodule is that section, or sections of a linear particle accelerator composed of superconducting niobium cavities used in a linear accelerator, or linac. The cryomodule is a complex, state-of-the-art supercooled component in which particle beams are accelerated for scientific research. The niobium cavities are cooled with liquid helium to an operating temperature of 2 kelvins to supercool this section of the accelerator s ...

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Alpha Ceti (α Cet / α Ceti) is a star in the constellation of Cetus. It also has the traditional name Menkar or Menkab. Menkar is an old and dying star, long past the hydrogen and perhaps even past the helium stage of its stellar evolution. Menkar is currently a red giant star but as it begins to burn its carbon core it will likely become highly unstable before finally shedding its outer layers and forming a planetary nebula ...

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Cosmogenic isotopes are rare radioactive isotopes created when cosmic radiation interacts with an atomic nucleus. These isotopes are produced on Earth, in Earth's atmosphere, and in extraterrestrial items such as meteorites. Some cosmogenic isotopes include: helium-3 beryllium-10 carbon-14 neon-21 aluminum-26 chlorine-36 calcium-41 iodine-129 Cosmogenic isotope - Applications. Because cosmogenic isotopes have l ...

Including:

• Cosmogenic isotope - Applications

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Amphion Loudspeakers is a Kuopio, Finland based company producing high-quality loudspeakers. In their designs, they emphasize controlled directivity to minimize the effect of room reflections on sound quality. Amphion Loudspeakers - Products. Helium (discontinued) Helium2 Athene (discontinued) Athene2 Creon (discontinued) Creon2 Origo Argon (discontinued) Argon2 Xenon Crypton Impact 500 Including:

• Amphion Loudspeakers - Products

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To help compare different orders of magnitude this page lists lengths between 10-11 m and 10-10 m (10 pm and 100 pm). Lengths shorter than 10 pm 25 pm — radius of Hydrogen atom 31 pm — radius of Helium atom Lengths longer than 100 pm See also. Orders of magnitude (length) ...

Read more here: » 1 E-11 m: Encyclopedia - 1 E-11 m

Californium is a synthetic element in the periodic table that has the symbol Cf and atomic number 98. A radioactive transuranic element, californium has very few uses and was discovered by bombarding curium with alpha particles (helium ions). Californium - Notable characteristics. Weighable amounts of californium make it possible to determine some of its properties using macroscopic quantities. Californium-252 (2.6 year half-life) is a very strong neutron emitter and is thus extremely radioactive and ...

Including:

• Californium - Notable characteristics
• Californium - History
• Californium - Isotopes

Read more here: » Californium: Encyclopedia - Californium

In cosmology, the Alpher-Bethe-Gamow paper (or αβγ paper) was created by Ralph Alpher, at the time a physics PhD student, and his advisor George Gamow. Their work, which would become the subject of Alpher's PhD thesis, argued that the big bang would be expected to create hydrogen, helium and heavier elements in the correct proportions to explain their abundance in the early universe. While the original theory neglected a number of processes important to the formation of heavy elements, subsequent developments showed that big bang nucleosynthesis is consi ...

Including:

• Alpher-Bethe-Gamow paper - Bethe's name
• Alpher-Bethe-Gamow paper - Main shortcoming of the theory

Read more here: » Alpher-Bethe-Gamow paper: Encyclopedia - Alpher-Bethe-Gamow paper

Radiation can refer to one of the following: Specific types in physics: Alpha radiation, composed of the nuclei of helium-4 atoms. Beta radiation, consisting of energetic electrons or positrons. Gamma radiation, which are high-energy electromagnetic waves such as X rays. Delta radiation Epsilon radiation Cherenkov radiation, radiation by a particle moving through an insulating medium faster than the speed of light in that medium. Electromagnetic radiation, a str ...

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