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Helium - Wikipedia On Earth, it is relatively rare—5 2 ppm by volume in the atmosphere Most terrestrial helium present today is created by the natural radioactive decay of heavy radioactive elements (thorium and uranium, although there are other examples), as the alpha particles emitted by such decays consist of helium-4 nuclei
Helium - Own the Air Helium flips the traditional wireless infrastructure model and puts you in charge The economic engine of this model is HNT, a cryptocurrency, which fuels the growth of the Helium Network and rewards participants for helping to build a more connected future
Helium | Definition, Properties, Uses, Facts | Britannica Helium, chemical element, inert gas of Group 18 (noble gases) of the periodic table The second lightest element, helium is a colorless, odorless, and tasteless gas that becomes liquid at -268 9 degrees Celsius
About Helium - Bureau of Land Management Helium is an odorless, nontoxic, colorless, tasteless gas; it has a very low chemical reactivity and it is lighter than air These characteristics are why helium plays a prominent role in space exploration, national defense, scientific research, medical technology, high-tech manufacturing and energy programs
HELIUM中文 (简体)翻译：剑桥词典 - Cambridge Dictionary It is a helium-neon based, one colour, three beam system, capable of measuring two components of velocity using light polarization for discrimination
Helium – expert written, user friendly element information Helium was made in the first three minutes of the universe’s existence, when temperatures everywhere were high enough for nuclear fusion to occur This short, high energy phase is represented at the very bottom of the diagram Helium is also made by nuclear fusion of hydrogen in stars like our own Image: Gnixon
Helium: A Natural Gas Byproduct with Unique Properties and Uses Helium is used for a lot more than party balloons In its most important use, liquid helium is used to cool MRI machines in hospitals Its diverse properties allow helium gas and liquid helium to be used in many ways