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Oxygen storage
Methods of oxygen storage for subsequent use span many approaches, including high pressures in oxygen tanks, cryogenics, oxygen-rich compounds and reaction mixtures, and chemical compounds that reversibly release oxygen upon heating or pressure change. O2 is the second most important industrial gas.
==Air==
Air is the most common source and reservoir of oxygen, containing 20.8%〔oxygen〕 This concentration is sufficient for many purposes, such as combustion of many fuels, corrosion of many metals, and breathing of animals. Most humans can function at rest with an oxygen level of 15% at one atmosphere pressure;〔http://www.newton.dep.anl.gov/askasci/zoo00/zoo00755.htm Oxygen and Human Requirements〕 a fuel such as methane is combustable down to 12% oxygen in nitrogen.〔Limiting oxygen concentration〕
A small room of 10 meter3 has 2.08 meter3 (2080 liters) or 2.99 kg of oxygen which would occupy 2.62 liters if it was liquid.〔2 meter x 2 meter x 2.5 meter = 10 meter3 times concentration and density of Oxygen at STP〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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