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Oksijenoksijen, also known as dioxygen, is a chemical compound with the formula O2. It is a colorless, odorless, and tasteless gas that makes up about 21% of the Earth's atmosphere. O2 is essential for most forms of life, as it is a key component in the process of cellular respiration, where it is used to convert nutrients into energy. In this process, oxygen combines with glucose to produce carbon dioxide, water, and energy in the form of ATP.

Oxygen is the third most abundant element in the universe, after hydrogen and helium. It is highly reactive and readily forms compounds with most elements. In its molecular form, O2, it is relatively stable but can be converted into other forms of oxygen, such as ozone (O3) or superoxide (O2-). Ozone is a powerful oxidizing agent and is found in the Earth's stratosphere, where it absorbs ultraviolet radiation. Superoxide is a reactive form of oxygen that can cause damage to cells and tissues.

Oxygen is produced through various natural processes, including photosynthesis in plants and algae, and through the electrolysis of water. It is also a byproduct of many industrial processes, such as the combustion of fossil fuels. Oxygen is used in a wide range of applications, including medical treatments, welding, and as a propellant in rocket engines. It is also used in the production of steel and other metals, as well as in the synthesis of chemicals and pharmaceuticals. Despite its importance, oxygen is a finite resource, and its availability is a critical factor in the sustainability of life on Earth.