There is no doubt that none of the chemical elements have played a more important role than oxygen in the development of chemistry. This life-giving gas was able to make such a huge breakthrough in chemistry in the late eighteenth century that it had never been possible before.

In addition to molecular oxygen, oxygen has other deformations, which include ozone. The ozone molecule is able to absorb the ultraviolet light emitted by the sun, and as a result, the ozone layer covering the earth protects life on Earth from destructive ultraviolet rays. However, ozone produced near the Earth's surface is a byproduct of the reaction of smog and is therefore considered a polluting agent.

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Oxygen is commonly used in the production of steel, plastics, textiles, oxygen cutting of steel, rocket propulsion, oxygen therapy and life support systems in airplane, submarines, space flights and diving. Multiple applications of oxygen gas as an oxidizer is of high importance. The electronegativity of oxygen is very high, which makes it susceptible to reaction. Only fluorine has a higher electronegativity than oxygen. Due to its oxidizing properties, oxygen is used as fuel in missiles. The discovery of oxygen in the air and its extraction from the air meets the practical needs. Air-extracted oxygen is used in a mixture with low-density gas such as helium as a breathing mixture for respiratory patients as well as divers. Oxygen is also used in welding, steel production and methanol production.

The carbon dioxide produced reduces iron oxides to pure iron compounds. Oxygen is used in applications involving metal and requiring high temperatures, such as welding torches.

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