Oxygen

The Field of Ice Jules Verne. Unrepairable The words irreparable and unrepairable are synonyms that mean unable to be fixed. The unusually high concentration of oxygen gas on Earth is the result of the oxygen cycle. This class of compounds includes the heme proteins hemoglobin and myoglobin.

In nature, free oxygen is produced by the light-driven splitting of water during oxygenic photosynthesis. Oxygen combines with most elements, is required for combustion, and is essential for life in most organisms. Note When we breathe in oxygen, it is carried by the hemoglobin in our blood throughout the body, banna songs where it is used to generate energy by oxidation.

Occurrence and properties

Progress on the development of an integrated canopy fluorescence model. Several artificially prepared radioactive isotopes are known. Books View or order collections of articles. There is epidemiological support for its use from a statistical study of cases recorded in a long term database.

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Journal of Physical and Chemical Reference Data. Oxygen dissolves more readily in water than nitrogen, and in freshwater more readily than seawater. By mass, oxygen is the third- most abundant element in the universe, after hydrogen and helium. Royal Society of Chemistry, p.

Source of stellar energy View More. Chemistry portal Medicine portal. American television channel. So called because oxygen was then considered essential in the formation of acids it is now known not to be. It is much more reactive with common organic molecules than is molecular oxygen per se.

When such an agent reacts with an electron-donating substance, its own oxidation state is lowered. Find out more on Wikipedia's Sister projects. The large values of the electronegativity and the electron affinity of oxygen are typical of elements that show only nonmetallic behaviour. Both men lowered the temperature of air until it liquefied and then distilled the component gases by boiling them off one at a time and capturing them separately.

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Dioxygen in biological reactions. For a time during the talk show's syndication run, Oxygen aired week-delayed repeats of The Tyra Banks Show. Hyper- is a prefix that means excess or exaggeration, while hypo- is another prefix that means under or beneath. Unfortunately, our editorial approach may not be able to accommodate all contributions. Chemistry and Physics of the Stratosphere and Mesosphere.

Established in by the German alchemist J. The channel later began to focus chiefly on reality shows, reruns, and movies.

Oxygen Official Site

Any text you add should be original, not copied from other sources. Diatomic chemical elements.

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It is available through most providers. History at your fingertips. This property of accepting electrons by complete or partial transfer defines an oxidizing agent. It is also commonly claimed that oxygen was first discovered by Swedish pharmacist Carl Wilhelm Scheele. Pure oxygen is used in submarines and diving bells.

Organic compounds important in industry and commerce that are made by direct oxidation of a precursor include ethylene oxide and peracetic acid. Notes and Records of the Royal Society of London. The process takes advantage of the fact that when a compressed gas is allowed to expand, it cools. You can make it easier for us to review and, hopefully, publish your contribution by keeping a few points in mind. The French chemist Antoine Laurent Lavoisier later claimed to have discovered the new substance independently.

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Oxygen levels in the atmosphere are trending slightly downward globally, possibly because of fossil-fuel burning. Oxygen tents were once commonly used in oxygen supplementation, but have since been replaced mostly by the use of oxygen masks or nasal cannulas. Analysis of a silicon wafer exposed to the solar wind in space and returned by the crashed Genesis spacecraft has shown that the Sun has a higher proportion of oxygen than does the Earth. In one experiment, Lavoisier observed that there was no overall increase in weight when tin and air were heated in a closed container. Marine organisms then incorporate more oxygen into their skeletons and shells than they would in a warmer climate.

After a set cycle time the operation of the two beds is interchanged, thereby allowing for a continuous supply of gaseous oxygen to be pumped through a pipeline. This trade-off of higher oxygen concentration for lower pressure is needed to maintain suit flexibility. Ambient pressure divers breathe air or gas mixtures with an oxygen fraction suited to the operating depth. Medical applications of oxygen include use in oxygen tents, inhalators, and pediatric incubators.

Definition of Oxygen at

In other projects Wikimedia Commons Wikiquote. Los Alamos National Laboratory. Fourteen radioisotopes have been characterized.

Articles with short description. Hair Battle Spectacular Hey Monie! Almost all the free oxygen in the atmosphere is due to photosynthesis. Its most important compound is water. For other forms of this element, see Allotropes of oxygen.

Occurrence and properties

The element is similarly found in almost all biomolecules that are important to or generated by life. An early commercial procedure for isolating oxygen from the atmosphere or for manufacture of hydrogen peroxide depended on the formation of barium peroxide from the oxide as shown in the equations.

The treatment of sewage by oxygen holds promise for more efficient treatment of liquid effluents than other chemical processes. It reacts very readily with oxygen by burning smokelessly, with carbon dioxide and water as its byproducts.

The paramagnetic behaviour of oxygen confirms the presence of such electrons. Angewandte Chemie International Edition.

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