Gas Introduction
Oxygen is a simple substance formed from the element oxygen, with the chemical formula O2. Its chemical properties are relatively active and it can react with most elements. Not very lively at room temperature and not easily interacts with many substances. But it is very active at high temperatures and can directly combine with various elements, which is related to the electronegativity of oxygen atoms being second only to fluorine.
Oxygen is a colorless and odorless gas, and is the most common elemental form of oxygen. Melting point -218.4 ℃, boiling point -183 ℃. Not easily soluble in water, about 30mL of oxygen can be dissolved in 1L of water. Oxygen accounts for about 21% in the air. Liquid oxygen is sky blue. Solid oxygen is a blue crystal.
Oxygen is the most widely distributed element in nature, accounting for 48.6% of the crustal mass and being the most abundant element. Oxygen is required for the oxidation of hydrocarbons, treatment of wastewater, rocket propellants, and for respiration of animals and humans in aviation, aerospace, and diving. Animal respiration, combustion, and all oxidation processes (including the decay of organic compounds) consume oxygen. But oxygen in the air can be continuously replenished through the photosynthesis of plants. In the cutting and welding of metals. It is a mixture of oxygen with a purity of 93.5%~99.2% and combustible gas (such as acetylene) to produce a flame at extremely high temperatures, thereby melting the metal. The metallurgical process cannot do without oxygen. Oxygen is also required to enhance the production process of nitric acid and sulfuric acid. By blowing a mixture of oxygen and water vapor into a gasifier without using air, high calorific value gas can be obtained. Medical gas is extremely important.

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