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less than % by volume in natural gas. helium is recovered, refined, and liquefied. liquid helium is typically shipped from production sources to storage and transfill facilities. tankers, ranging in size from to gallons, contain an annular space insulated with vacuum, nitrogen shielding, and multilayer
no senses that can detect the presence of heli- um. although helium is nontoxic and inert, it can act as a simple asphyxi- ant by displacing the oxygen in air to levels below that required to support life. inhalation of helium in excessive amounts can cause dizziness, nausea, vomiting, loss of consciousness...
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