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Helium is used as an inert-gas atmosphere for welding metals such as aluminum; in rocket propulsion (to pressurize fuel tanks, especially those for liquid hydrogen, because only helium is still a gas at liquid-hydrogen temperature); in meteorology (as a lifting gas for instrument-carrying balloons); in cryogenics (as a coolant because liquid ...
Element Helium (He), Group 18, Atomic Number 2, s-block, Mass 4.003. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
Helium at low temperatures is used in cryogenics and in certain cryogenic applications. As examples of applications, liquid helium is used to cool certain metals to the extremely low temperatures required for superconductivity, such as in superconducting magnets for magnetic resonance imaging.
Explore the versatile world of Helium, the second most abundant element in the universe. Learn about its physical and chemical properties, historical background, and varied applications in healthcare, industry, and everyday life.
Chemical Properties. Helium is an inert (Nobel) gas under all standard conditions [5]. In plasma form or subjected to electron bombardment, helium can from unstable compounds with certain metals including, sulfur, iodine, phosphorus and tungsten. These compounds are termed as excimers.
Helium is the second most abundant element in the universe. Only hydrogen occurs more often than helium. Helium is also the second simplest of the chemical elements. Its atoms consist of two protons, two neutrons, and two electrons. Only the hydrogen atom is simpler than a helium atom.
31 gru 2009 · Although helium is part of the atmosphere, it is not economical to extract it from liquid air. Uses. A quarter of the helium produced is used as a coolant for super-conducting magnets in MRI instruments. Another major use is as an inert atmosphere for welding air-sensitive metals.
