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He oxygen is the chemical element of atomic number 8 which constitutes about one fifth of the Earth's atmospheric air in its molecular form O2 . In this molecular form that is composed of two atoms of this element, oxygen is a gas .

Oxygen is a key element of organic chemistry, as part of the water (H2O)strong >, of oxides, of living beings and of almost all acids and organic substances. It is a colorless, odorless and tasteless gas, which is very reactive and is essential for breathing .

In both Medicine and Industry or Science, oxygen becomes a fundamental and indispensable element for their development. Thus, for example, in the first mentioned area the chemical element in question is used to improve the health and condition of patients who need it because they are suffering from certain pathologies or diseases.

Thus, for example, in medical centers, oxygen supplements are used to relieve or treat people who are suffering from both pneumonia and emphysema or even various types of heart failure.

In the case of industry, as we have mentioned above, the chemical element in question is also used. More specifically, one of the most widespread uses of it is in the field of iron smelting in order to obtain steel. However, it is also used to obtain textile products such as polyester or even antifreeze.

The discovery of oxygen occurred between 1772 and 1773 by the Swedish chemist, of German origin, Karl Wilhelm Scheele (1742-1786 ). Around that same time, the British Joseph Priestley (1733-1804 ) also discovered oxygen independently, while the French Antoine Lavoisier (1743-1794 ) was the first to publish a study on this chemical element, in 1777 .

The O2 is generated from the process of photosynthesis of plants and is used by animals and humans in breathing. Oxygen can be found in liquid form in laboratories and in solid form from temperatures below -219º.

The abnormal decrease in partial pressure of oxygen in the blood is known as hypoxemia . The hypoxia , on the other hand, is the decrease in the diffusion of oxygen in the tissues. Refering to anoxia , it is the almost total or absolute lack of oxygen. Anoxia can lead to the death of the organism.

In addition to all of the above, we cannot overlook the existence in our colloquial language of some expressions that make use of the term oxygen that we are now analyzing. This would be the case of the expression "oxygen balloon", with which we try to express that a person in a complicated or very committed moment of his life has found either a relief or an element that allows him to "breathe" and get out of the situation in which she is immersed.

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