main source of helium
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Although it is rare on Earth, helium is the second most abundant element in the known Universe (after hydrogen), constituting 23% of its baryonic mass. The vast majority of helium was formed by Big Bang nucleosynthesis one to three minutes after the Big Bang. As such, measurements of its abundance contribute to cosmological models. In stars, it is formed by the nuclear fusion of hydrogen in proton-proton chain reactions and the CNO cycle, part of stellar nucleosynthesis.
In the Earth's atmosphere, the concentration of helium by volume is only 5.2 parts per million. The concentration is low and fairly constant despite the continuous production of new helium because most helium in the Earth's atmosphere escapes into space by several processes and is lost forever. The Earth's heterosphere, a part of the upper atmosphere, helium and other lighter gases are the most abundant elements.
In the Earth's crust, the concentration of helium is 8 parts per billion. In seawater, the concentration is only 4 parts per trillion. There are also small amounts in mineral springs, volcanic gas, and meteoric iron. Because helium is trapped in the subsurface under conditions that also trap natural gas, the greatest natural concentrations of helium on the planet are found in natural gas, from which most commercial helium is extracted.
Last year, British scientists discovered a large helium gas field in Africa. This deposit, located in the United Republic of Tanzania, measures approximately 54 million cubic feet of volume and is the largest helium deposit in the world.
In the Earth's atmosphere, the concentration of helium by volume is only 5.2 parts per million. The concentration is low and fairly constant despite the continuous production of new helium because most helium in the Earth's atmosphere escapes into space by several processes and is lost forever. The Earth's heterosphere, a part of the upper atmosphere, helium and other lighter gases are the most abundant elements.
In the Earth's crust, the concentration of helium is 8 parts per billion. In seawater, the concentration is only 4 parts per trillion. There are also small amounts in mineral springs, volcanic gas, and meteoric iron. Because helium is trapped in the subsurface under conditions that also trap natural gas, the greatest natural concentrations of helium on the planet are found in natural gas, from which most commercial helium is extracted.
Last year, British scientists discovered a large helium gas field in Africa. This deposit, located in the United Republic of Tanzania, measures approximately 54 million cubic feet of volume and is the largest helium deposit in the world.
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the main source of helium is hydrogen with the combination of hydrogen helium is made
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