?What is helium gas
Helium is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements, and it does not have a melting point at standard pressures. It is the second-lightest and second most abundant element in the observable universe, after hydrogen. It is present at about 24% of the total elemental mass, which is more than 12 times the mass of all the heavier elements combined.
Its abundance is similar to this in both the Sun and Jupiter, because of the very high nuclear binding energy (per nucleon) of helium-4, with respect to the next three elements after helium. This helium-4 binding energy also accounts for why it is a product of both nuclear fusion and radioactive decay. The most common isotope of helium in the universe is helium-4, the vast majority of which was formed during the Big Bang. Large amounts of new this gas are created by nuclear fusion of hydrogen in stars. . Sepehr Gas Kavian has an ISO17025 certificate and is a reference laboratory of the Iranian Standards Authority. To buy pure and mixed gases, call 02146835980
Type: pure gas
Hazards
Inhaling He can be dangerous if done to excess, since this gas is a simple asphyxiant and so displaces oxygen needed for normal respiration.
Isotopes
There are nine known isotopes of He of which two, helium-3 and helium-4, are stable. In the Earth’s atmosphere, one atom is 3
He for every million that are 4
He. Unlike most elements, helium’s isotopic abundance varies greatly by origin, due to the different formation processes. The most common isotope, helium-4, is produced on Earth by alpha decay of heavier radioactive elements; the alpha particles that emerge are fully ionized helium-4 nuclei. Helium-4 is an unusually stable nucleus because its nucleons are arranged into complete shells. It was also formed in enormous quantities during Big Bang nucleosynthesis.
Helium-3 is present on Earth only in trace amounts. Most of it has been present since Earth’s formation, though some falls to Earth trapped in cosmic dust. Trace amounts are also produced by the beta decay of tritium. Rocks from the Earth’s crust have isotope ratios varying by as much as a factor of ten, and these ratios can be used to investigate the origin of rocks and the composition of the Earth’s mantle.
Properties
The chemical symbol and the chemical formula for He gas is He. It is part of group 18 on the periodic table which is the noble gases. They are also known as inert gases due to their extremely low reactivity and stable states in their gaseous forms. He is the second most abundantly found gas in the Universe, behind Hydrogen. Some of the other properties of the He element are listed below:
Atomic number: 2
Atomic mass: 4 g/mol
Odor: None, it is odorless
Color: None, it is colorless
Taste: None, it is tasteless
Chemical formula and symbol: He
Helium Atom with 2 protons (+), and 2 electrons (-)
Applications
He has many unique properties: low boiling point, low density, low solubility, high thermal conductivity and inertness, so it is use for any application which can explioit these properties. this gas was the first gas used for filling balloons and dirigibles. This application goes on in altitude research and for meteorological balloons. The main use of this gas is as an inert protection gas in autogenous welding.
Its biggest potential is found in applications at very low temperatures. He is the only cooler which is capable of reaching temperatures lower than 15 K (-434ºF). The main application of ultralow temperature is in the development of the superconductivity state, in which the resistance to the electricity flux is almost zero. Other applications are its use as pressurizing gas in liquid propellants for rockets, in helium-oxygen mixtures for divers, as working fluid in nuclear reactors cooled down by gas and as gas carrier in chemical analysis by gas chromatography.
Preparation
To buy pure gases such as Argon, oxygen, hydrogen and nitrogen, contact Sepehr Gas Kavian.
02146835980
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