What is oxygen?

  • (noun): A nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust.
    Synonyms: O, atomic number 8

Oxygen

Oxygen is a chemical element with symbol O and atomic number 8. Its name derives from the Greek roots ὀξύς (oxys) ("acid", literally "sharp", referring to the sour taste of acids) and -γόνος (-gοnos) ("producer", literally "begetter"), because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless, odorless, tasteless diatomic gas with the formula O2. This substance is an important part of the atmosphere, and is necessary to sustain most terrestrial life.

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Some articles on oxygen:

Methemoglobinemia
... Methemoglobin is an oxidized form of hemoglobin that has a decreased affinity for oxygen, resulting in an increased affinity of oxygen to other heme sites (that are ... ability of the red blood cell to release oxygen to tissues, with the associated oxygen–hemoglobin dissociation curve therefore shifted to the left ...
Oxygen Isotope Ratio Cycle
... Oxygen isotope ratio cycles are cyclical variations in the ratio of the abundance of oxygen with an atomic mass of 18 to the abundance of oxygen with an atomic ...
Oxygen - Safety and Precautions - Combustion and Other Hazards
... Highly concentrated sources of oxygen promote rapid combustion ... Oxygen itself is not the fuel, but the oxidant ... Combustion hazards also apply to compounds of oxygen with a high oxidative potential, such as peroxides, chlorates, nitrates, perchlorates, and dichromates because they can donate oxygen to a fire ...
Oxyhydrogen
... Oxyhydrogen is a mixture of hydrogen (H2) and oxygen (O2) gases ... to define knallgas to be a generic term for the mixture of fuel with precise amount of oxygen required for complete combustion, thus 21 oxyhydrogen would ...
Reactive Oxygen Species
... Reactive oxygen species (ROS) are chemically reactive molecules containing oxygen ... Examples include oxygen ions and peroxides ... ROS form as a natural byproduct of the normal metabolism of oxygen and have important roles in cell signaling and homeostasis ...

Famous quotes containing the word oxygen:

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    Anne Sexton (1928–1974)