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We use this element for medical purposes. If anyone has difficulty breathing or a rapid heart rate, doctors will use oxygen to regulate their breath.

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Oxygen is required for microbes to decompose organic wastes efficiently. Some decomposition occurs without oxygen (anaerobic conditions); however, the process is slow, and foul odors may develop.

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Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is called the fuel, and the source of oxygen is called the oxidizer.

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The exposure of iron (or an alloy of iron) to oxygen in the presence of moisture leads to the formation of rust. This reaction is not instantaneous, it generally proceeds over a considerably large time frame.

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Cutting & Welding. Oxygen is also used in torches for cutting & welding. It reacted with hydrogen enabling it to heat over 5000 degrees

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Dissolved oxygen (DO) is the amount of oxygen that is present in water. Water bodies receive oxygen from the atmosphere and from aquatic plants.

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Carbon dioxide (commonly abbreviated as CO₂) is a clear gas composed of one atom of carbon (C) and two atoms of oxygen (O). Carbon dioxide is one of many molecules where carbon is commonly found on the Earth.

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Sulfur oxides are a group of molecules made of sulfur and oxygen atoms, such as sulfur dioxide (SO₂) and sulfur trioxide (SO₃). Sulfur oxides are pollutants that contribute to the formation of acid rain and particulate pollution.

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Nitrogen oxides are produced in combustion processes, partly from nitrogen compounds in the fuel, but mostly by a direct combination of atmospheric oxygen and nitrogen in flames.

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Carbon monoxide combines with oxygen to form carbon dioxide according to the following equation: 2 CO + O 2 → 2 CO 2. 200 cm 3 of carbon monoxide is mixed with 200 cm 3 of oxygen and the mixture explodes.