oxygen debt synonyms, oxygen debt pronunciation, oxygen debt translation, English dictionary definition of oxygen debt. These bonds give oxides (for example iron reacts with oxygen to give iron oxide). [39], The oxidation state of oxygen is −2 in nearly every compound it is in. oxygen saturation sO 2 The O 2 concentration of blood expressed as a ratio of its total O 2-carrying capacity; the OS is a measure of the utilization of O 2 transport capacity; sO 2 is ↑ at high altitude, hypocapnia, hypothermia, ↑ cardiac output, O 2 therapy, PEEP–positive end-expiratory pressure ventilation, and respiratory alkalosis. When there is the same amount of air and water, there is one molecule of O2 for every 2 molecules of N2 (a ratio of 1:2). It has the symbol O and atomic number 8. to 49.2%[33] of the Earth's crust as part of oxide compounds like silicon dioxide and other compounds like carbonates. [3], Materials that leave very little residue when they burn, like wood or coal, were thought to be made mostly of phlogiston. 5. Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020, Collins English Dictionary - Complete & Unabridged 2012 Digital Edition Oxygen is a chemical element. Most living things use oxygen in respiration. For example, according to this definition, when ethanol is oxidized into ethanal: The American Heritage® Science Dictionary For example, he wrongly thought that water (H2O) had the formula of just HO. It is a very reactive nonmetal. Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Oxygen Short, Inc. is a 501(c)(3) organization founded to address some of the most serious threats to our oxygen-producing ecosystems. Oxygen Short, Inc. was created to inspire and drive consumer-based change to protect all sources of planetary oxygen. Pure oxygen is used but at a much lower pressure. From this experiment he got a gas that he called "dephlogisticated air". [15] Later chemists realised that Lavoiser's name for the gas was wrong, but the name was too common by then to change.[16]. Published by Houghton Mifflin Harcourt Publishing Company. Some say that oxygen was discovered by Swedish pharmacist Carl Wilhelm Scheele. n. The amount of extra oxygen required by muscle tissue during recovery from vigorous exercise. He also found that air rushed in when the container was opened. Lavoisier did the first main experiments on oxidation. Oxygen makes up around 21% of the Earth's atmosphere and 50% of the mass of the Earth's crust. The human brain needs to be without oxygen for only four minutes before permanent damage occurs. [2] Philo thought this was because the air was turned into the classical element fire. O2 has a bond length of 121 pm and a bond energy of 498 kJ/mol[21] Because of its energy, O2 is used by complex life like animals. [a][47] Oxygen toxicity usually begins to occur at pressures more than 50 kilopascals (kPa), equal to about 50% oxygen in the air at standard pressure (air on Earth has around 20% oxygen). oxygen, O, atomic number 8 (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 oxygen meaning: 1. a chemical element that is a gas with no smell or colour. From this, he worked out that oxygen is used for both respiration and combustion. Oxygen is more than a fifth of the Earth's atmosphere by volume. Carbon, hydrogen, oxygen and nitrogen are all lifeless bodies. Oxygen, a colorless, odorless, tasteless gas essential to living organisms, being taken up by animals, which convert it to carbon dioxide; plants, in turn, utilize carbon dioxide as a source of carbon and return the oxygen to the atmosphere. Her aunt eventually recovered, was taken off a ventilator and is home, though she still needs oxygen. The oxygen in these oxides and in other compounds (mostly silicate minerals, and calcium carbonate in limestone) makes up nearly half of the Earth's crust, by mass. [19], At standard temperature and pressure, oxygen has no colour, odour or taste. It is the third most common element in the universe, after hydrogen and helium. In the air, two oxygen atoms usually join to make dioxygen (O 2), a colourless gas. oxygen definition: 1. a chemical element that is a gas with no smell or colour. It reacts very readily with oxygen by burning smokelessly, with carbon dioxide and water as its byproducts. It gives a gas stream that is 90% to 93% oxygen. Learn about what oxygen is, how it is produced and different oxygen compounds that you use in your daily life. oxygen - 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 … It also has medical uses and is used for breathing when there is no good air (by divers and firefighters, for example), and for welding. We now call this oxygen (O2). [46], At high pressures, oxygen gas (O2) can be dangerous to animals, including humans. [3][14] It is because his findings were published first that he is often said to have discovered oxygen. [6] His findings were published in 1775. Iron's surface will turn to rust (iron oxide) when in air for a long time. Liquid oxygen and oxygen-rich compounds can be used as a rocket propellant. Oxygen is the chemical element with the symbol O and atomic number 8. About 99.7% of oxygen is the 16O isotope. After hydrogen and helium, oxygen is the third-most abundant element in the universe by mass. 183+26 sentence examples: 1. It is the supporter of combustion in air and was the standard of atomic, combining, and molecular … This bond can be called many things, but simply called a covalent double bond. Some people believe this was the discovery of oxygen while others disagree. Oxygen is also found in nearly all biomolecules that are made by living things. English chemist John Mayow added to this by showing that fire only needed a part of air. All rights reserved. Oxygen levels will be decreased to accommodate fewer people. When we breathe in oxygen, it is carried by the, Oxygen is a waste product of green plants and. The other (nitrogen) he called "azote", which means "lifeless" in Greek. Scheele also sent a letter to Lavoisier in that year that spoke of his discovery.[13]. This is often because of lung conditions that prevents the lungs from absorbing oxygen, including: They are 16O, 17O, and 18O. The other main method of making oxygen is by passing a stream of clean, dry air through a pair of zeolite molecular sieves. Oxygen forms a large part of the air…. O2 combines with most elements, is required for combustion, and chronic obstructive pulmonary.! Into water than nitrogen does electrolysis of water, which means `` lifeless '' in Greek master these essential terms. Air were heated in a combined state in nature materials were made of parts. 6 ], breathing pure O2 can cause a huge fire released is called as Respiratory.... 'S mass is oxygen. [ 20 ] human brain needs to be placed boxes. Other words, a colourless gas that he is often said to have discovered.. Gospel singer Tonéx 's second major release the other main method of making oxygen is a gas that... Sun 's mass is oxygen. [ 13 ] about his experiment dioxygen. [ 13 ] dioxygen! 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