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Oxygen composes approximately 21% by volume or 23.15% by weight of the atmosphere. At atmospheric pressure, oxygen boils at -182.96°C (-297.33°F), melts at -218.4°C (-361.1°F), has a gaseous specific gravity of 1.1, and has a density of 1.429 g/litre at 0°C (32°F). Oxygen is produced by air separation processes that use either cryogenic liquefaction and distillation or vacuum swing adsorption (VSA) separation. Oxygen may be stored and shipped in either liquid or gaseous form. Oxygen comprises 60% of the human body and is a constituent of all living tissues. Almost all plants and animals, including all humans, require oxygen, in the free or combined state, to maintain life. Oxygen is a component of many organic and inorganic compounds. It forms compounds called oxides with almost all the elements. Oxygen is a very strong oxidising agent, and can even form oxides with inactive metals such as platinum, iridium and gold. Oxygen is used in medicine for therapeutic purposes and in the metals industry for steelmaking and metal cutting applications. In the chemical and petroleum industries, oxygen is used in the production of a wide variety of fuels and chemicals. More about Oxygen:
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