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Per-kilogram prices of some synthetic radioisotopes range to trillions of dollars. ... ( mg / kg ) Price [7] Year Source Notes USD/kg ... Helium: 0.0001785: 0. ...
Standard atomic weight A r ° ... the consumption of helium within the U.S. had risen to more than 15 million kg per year. [80] ... From 2002 to 2007 helium prices ...
Liquid helium is a physical state of helium at very low temperatures at standard atmospheric pressures.Liquid helium may show superfluidity.. At standard pressure, the chemical element helium exists in a liquid form only at the extremely low temperature of −269 °C (−452.20 °F; 4.15 K).
Fewer than 10 countries in the world produce helium. South Africa will be the latest when Renergen starts commercial production of the critical gas. A company bought gas rights to this land for $1.
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In August 2014, the Bureau of Land Management auctioned crude helium from the national reserve at an average price of US$104 per thousand cubic feet of helium content. [29] Grade A helium sold for about $200 per thousand cubic feet, or $7.21 per cubic meter in 2014.
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1 m 3 × 1.202 kg/m 3 × 9.8 N/kg= 11.8 N. Therefore, the amount of mass that can be lifted by helium in air at sea level is: (1.292 - 0.178) kg/m 3 = 1.114 kg/m 3. and the buoyant force for one m 3 of helium in air at sea level is: 1 m 3 × 1.114 kg/m 3 × 9.8 N/kg= 10.9 N. Thus hydrogen's additional buoyancy compared to helium is: