Oxygen, abbreviated O2, is a colorless, odorless, non-flammable gas. It is an oxidizing gas at high pressure. Oxygen constitutes approximately 21% of the air. When considered in other combinations such as water (H2O) oxygen makes up about 49% of the molecules on the earth's crust.

The oxygen molecule has a gaseous specific gravity of 1.1, and a boiling point of -297.3 deg. F (-183 deg. C). Oxygen is produced by air separation processes that use either cryogenic liquefaction and distillation or vacuum swing adsorption (VSA) separation. Oxygen can be stored and shipped as either a gas or a cryogenic liquid.

A human being can survive three weeks without food, three days without water but only two breaths of air without oxygen.

No modern hospital can manage without medical oxygen. It is an essential resource: in the operating theatre during anaesthesia, and for the respiration of patients in bed in the ward, intensive care or neonatal unit.

Key Properties
Oxygen is an active, life-sustaining component of the atmosphere; making up 20.94% by volume or 23% by weight of the air we breathe. The word originated from the Greek word oxys and genes meaning sharp or acid and born respectively. Combining these Greek words together forms oxy genes that means acid forming.

Used in first-aid treatment of emergencies such as suffocation and Heart attacks, in the treatment of patients with respiratory disorders, In anesthesia, in hyperbaric oxygen chambers for the treatment of Carbon monooxide poisoning and gas gangrene, and for other specialized oxygen therapies.

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