Oxygen is part of the chalcogen group on the periodic table. It has the symbol O and atomic number 8. Photosynthetic cyanobacteria that arose some 3 billion years ago, for instance, began terraforming the planet by emitting oxygen. The brain, also an organ, is particularly sensitive to the loss of oxygen. [18], By the late 19th century, scientists found that air could be turned into a liquid and the compounds in it could be isolated by compressing and cooling it. No single ignition source of the fire was conclusively identified, although some evidence points to an arc from an electrical spark. Oxygen Short, Inc. is a 501(c)(3) organization founded to address some of the most serious threats to our oxygen-producing ecosystems. That is, the sulphur always remains combined with four parts of oxygen. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gaswith the formula O 2. After breathing the gas, Priestley said that it felt like normal air, but his lungs felt lighter and easy afterwards. Pure oxygen is used but at a much lower pressure. to 49.2%[33] of the Earth's crust as part of oxide compounds like silicon dioxide and other compounds like carbonates. This page was last changed on 11 December 2020, at 04:29. This gas is often just called oxygen. [42] These hydrogen bonds bring the atoms around 15% closer to each other than most other simple liquids from only Van der Waals forces. Their decay proceeded without a ready supply of oxygen, producing hydrocarbons like methane instead of oxygen-bearing molecules. oxygen is listed in the World's largest and most authoritative dictionary database of abbreviations and acronyms. [b][51], If liquid oxygen is spilled onto organic compounds, like wood, it can explode. Neurons begin to die within four to six minutes of oxygen deprivation. [49] The Apollo 1 crew were all killed by a fire because the air of the capsule had a very high amount of oxygen. Oxygen is more than a fifth of the Earth's atmosphere by volume. 1 : a chemical element that constitutes 21 percent of the Earth's atmosphere, that is capable of combining with all elements except some noble gases, that is active in physiological processes of almost all known organisms, and that is involved especially in … One of the first known experiments on how combustion needs air was carried out by Greek Philo of Byzantium in the 2nd century BC. Robert Hooke, Ole Borch, Mikhail Lomonosov and Pierre Bayen all made oxygen in experiments in the 17th and 18th centuries. [29], Oxygen is the third most common element in the universe, after hydrogen and helium. [27] Both liquid and solid O2 are see-through with a light-blue colour. English chemist John Mayow added to this by showing that fire only needed a part of air. Learn more. [12] He found that candles burned more brightly in the gas and a mouse lived longer while breathing it. Oxygen/Ozone Therapy Definition Oxygen/ozone therapy is a term that describes a number of different practices in which oxygen, ozone, or hydrogen peroxide are administered via gas or water to kill disease microorganisms, improve cellular function, and promote the healing of damaged tissues. Tetraoxygen (O4) was discovered in 2001. He was the first person to say it was a chemical element. Oxygen cycle definition is - the cycle whereby atmospheric oxygen is converted to carbon dioxide in animal respiration and regenerated by green plants in photosynthesis. Hypoxemia is determined by measuring the oxygen level in a blood sample taken from an artery (arterial blood gas). [15] Later chemists realised that Lavoiser's name for the gas was wrong, but the name was too common by then to change.[16]. From this experiment he got a gas that he called "dephlogisticated air". Oxygen is a chemical element. Many organic compounds have oxygen in them. Oxygen dissolves more easily from air into water than nitrogen does. By 1811, Amedeo Avogadro correctly worked out what water was made of based on Avogadro's law. "Oxygen" became the name in the English language, even though English scientists were against it. This was stopped when some babies went blind from the oxygen. Researchers found no benefit for hospitalized patients who didn’t need extra oxygen. [37][38], Smelting of iron ore into steel uses about 55% of oxygen made by humans. This is often because of lung conditions that prevents the lungs from absorbing oxygen, including: Oxygen is the most common chemical element found on or in Earth. the complex process by which carbon dioxide, water, and certain inorganic salts are converted into carbohydrates by green plants, algae, and certain bacteria, using energy from the sun and chlorophyll. This was then also evaporated to cool oxygen gas in order to turn it into a liquid. Vigorous exercise increases oxygen After this, he found that the weight of the tin had increased by the same amount as the weight of the air that rushed in. Respiration then takes oxygen gas out of the atmosphere and turns it into carbon dioxide and water. 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. Copyright © 2011. Carbon dioxide consists of carbon and oxygen. Oxygen, hydrogen and nitrogen are all gases. Because of this, it is used in medicine. Carbon, hydrogen, oxygen and nitrogen are all lifeless bodies. This bond can be called many things, but simply called a covalent double bond. n. The amount of extra oxygen required by muscle tissue during recovery from vigorous exercise. [39], The oxidation state of oxygen is −2 in nearly every compound it is in. For example, he wrongly thought that water (H2O) had the formula of just HO. Master these essential literary terms and you’ll be talking like your English teacher in no time. N2 evaporates while O2 is left as a liquid. “Pagan” vs. “Wicca”: What Is The Difference? Oxygen Short, Inc. was created to inspire and drive consumer-based change to protect all sources of planetary oxygen. [7], J. J. Becher came up with the theory in 1667, and Georg Ernst Stahl added to it in 1731. Hypoxemia is a below-normal level of oxygen in your blood, specifically in the arteries. [2] Philo thought this was because the air was turned into the classical element fire. [41], Water (H2O) is an oxide of hydrogen. He was also right about how it helps combustion work. [36], Low-pressure O2 is used in space suits, surrounding the body with the gas. This can make them become healthy quicker if they are ill. In the air, two oxygen atoms usually join to make dioxygen (O2), a colourless gas. Water is made of two hydrogen atoms covalent bonded to an oxygen atom. [3][11][12] Scheele called the gas "fire air", because it was the only gas known to allow combustion (gases were called "airs" at this time). [5] The same thing happened when a live mouse was put into the box. [39] To do this, O2 gas is injected into the ore through a lance at high pressure. [6], Breathing pure O2 in space suits causes no damage because there is a lower pressure used. It is the most common oxide on Earth. In other words , a process in which oxidation of organic compounds occurs in cell and energy is released is called as Respiratory system. © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Acute conditions usually require short-term oxygen therapy. This removes any sulfur or carbon from the ore that would not be wanted. Scientists use symbols to stand for the chemical elements. Some people believe this was the discovery of oxygen while others disagree. Oxygen is a chemical element. The Free Dictionary. Atomic number 8; atomic weight 15.9994; melting point -218.8°C; boiling point -182.9°C; gas density at 0°C 1.429 grams per liter; valence 2. Oxygen forms a large part of the air…. Oxygen therapy is used to treat emphysema, pneumonia, some heart problems, and any disease that makes it harder for a person to take in oxygen. Where is oxygen found on Earth? Describe 2020 In Just One Word? Hypoxemia is a sign of a problem related to breathing or circulation, and may result in various symptoms, such as shortness of breath. This is then changed to ethylene glycol, which is used to make many products such as antifreeze and polyester (these can then be turned into plastics and fabrics). [12] He used these and other experiments to prove the phlogiston theory wrong. There are small amounts of carbon dioxide (CO2) in the air, and it is turned into carbohydrates during photosynthesis. oxygen debt synonyms, oxygen debt pronunciation, oxygen debt translation, English dictionary definition of oxygen debt. Published by Houghton Mifflin Company. This definition is the opposite of the oxygen definition, so it may cause confusion. Oxygen gas is used for making steel, plastics and textiles. Looking for online definition of oxygen or what oxygen stands for? About 99.7% of oxygen is the 16O isotope. [31] About 0.9% of the Sun's mass is oxygen.[12]. Many molecules in living things have oxygen in them, such as proteins, nucleic acids, carbohydrates and fats. It is used to increase the amount of oxygen in a persons blood so more respiration can take place. According to this definition, oxidation is the loss of hydrogen, while reduction is the gain of hydrogen. Priestley visited him in 1774 and told him about his experiment. Air was not part of this theory. 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. … Dictionary.com Unabridged It is one of the most important elements on planet Earth. [40] Compounds of oxygen with other oxygen states are very uncommon. None of them thought it was a chemical element. Normal arterial blood oxygen saturation levels in humans are 95–100 percent. All rights reserved. [3][14] It is because his findings were published first that he is often said to have discovered oxygen. The temperature can go as high as 1,700 °C because it is an exothermic reaction. The respiratory system, also called the gas exchange system, is the body getting rid of carbon dioxide and taking in oxygen.Carbon dioxide, a waste product, goes out of the body. French chemist Antoine Lavoisier later said he had discovered the substance as well. The most common method is fractional distillation of liquefied air. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. From this, he worked out that oxygen is used for both respiration and combustion. He was the first person to explain how combustion works. Define oxygen debt. These bonds give oxides (for example iron reacts with oxygen to give iron oxide). He also tried to prove that the substance discovered by Priestley and Scheele was a chemical element. It is also easier for O2 to dissolve in freshwater than in seawater. Algae, cyanobacteria and plants make the Earth's oxygen gas by photosynthesis, using the Sun's light to get hydrogen from water, giving off oxygen. Most carbohydrates have the same oxygen to hydrogen ratio as water. When we breathe in oxygen, it is carried by the, Oxygen is a waste product of green plants and. If the level is below 90 percent, it is considered low and called hypoxemia. Oxygen gas is the second most common part of the atmosphere, making up 20.95%[34] of its volume and 23.1% of its volume. Chemical oxygen demand testing is used to determine the amount of oxidation that … 2150 liters of oxygen weighs about 3 kilograms (6.6 lb). [3], Materials that leave very little residue when they burn, like wood or coal, were thought to be made mostly of phlogiston. (This is still the name of nitrogen in some languages, including French. Oxygen is very reactive and must be kept away from anything that can burn. Definition - What does Chemical Oxygen Demand (COD) mean? [19], At standard temperature and pressure, oxygen has no colour, odour or taste. In its extreme form, where oxygen is entirely absent, the condition is called anoxia. 3. a colourless odourless highly reactive gaseous element: the most abundant element in the earth's crust (49.2 per cent). Scheele also sent a letter to Lavoisier in that year that spoke of his discovery.[13]. [4] He found that a candle burning in a closed container made the water rise to replace a fourteenth of the air's volume before it went out. 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 … Priestley is usually thought to be the main discoverer because his work was published first (although he called it "dephlogisticated air", and did not think it was a chemical element). It is the supporter of combustion in air and was the standard of atomic, combining, and molecular weights until 1961, when carbon 12 became the new standard. [6], Premature babies used to be placed in boxes with air with a high amount of O2. Apart from iron, oxygen is the most common element on Earth (by mass). In the late 17th century, Robert Boyle found that air is needed for combustion. What’s The Difference Between “Yule” And “Christmas”? )[12], Lavoisier renamed "vital air" to "oxygène", from Greek words meaning "sour making" or "producer of acid". There are a lot of oxide compounds on Earth. Fish take in oxygen through their gills. Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012. COBUILD Advanced English Dictionary. We Asked, You Answered. 5. 4. Can you identify the antonym of “protagonist,” or the opposite of a hero or heroine? Hydrogen and oxygen combine to form water. One part, called phlogiston, was given off when the substance containing it was burned. Oxygen debt occurs when the body reaches a state of anaerobic respiration during intense exercise. [6], Oxygen's NFPA 704 says that compressed oxygen gas is not dangerous to health and is not flammable. He published his findings in 1777. But the truth is trees only supply about 6% of the oxygen... the vast majority comes from algae in the ocean. Oxygen is a colourless gas that exists in large quantities in the air. He also found that air rushed in when the container was opened. [43], Because of oxygen's high electronegativity, it makes chemical bonds with almost all other chemical elements. Most metal's surfaces are turned into oxides when in air. Oxides are made when metal elements react with oxygen, such as iron oxide, which is known as rust. [49], From Simple English Wikipedia, the free encyclopedia, (Report of Apollo 204 Review Board NASA Historical Reference Collection, NASA History Office, NASA HQ, Washington, DC). 2. It is often thought that the gas was discovered in 1773 by Carl Wilhelm Scheele, in Sweden, or in 1774 by Joseph Priestley, in England. [12] He wrote that air was made up of two gases. a colorless, odorless, gaseous element constituting about one-fifth of the volume of the atmosphere and present in a combined state in nature. It is essential for aerobic respiration and almost all combustion and is widely used in industry. An element, normally a gas, that makes up about one-fifth of the atmosphere of the Earth. For example, according to this definition, when ethanol is oxidized into ethanal: Oxygen is a part of water, which all known life needs to live. [6] O2 is the second most important industrial gas.Because it is more economical , oxygen is usually stored and transported as a liquid. So extra oxygen in the atmosphere may have provided the conditions for large insects to evolve. Things that corrode, like iron, were thought to contain very little. The New Dictionary of Cultural Literacy, Third Edition One he called "vital air" (oxygen), which is needed for combustion and respiration. The zeolite molecular sieves soaks up the nitrogen. In 1786, the French chemist Antoine Lavoisier coined a term for the element, Coronavirus Hit Latinos Harder Thanks to a Perfect Storm of Disparities, How Earth’s Climate Changes Naturally (and Why Things Are Different Now), The steroid dexamethasone is the first drug shown to reduce COVID-19 deaths, Minecraft’s big bees don’t exist, but giant insects once did, A Guide to the Scientific Knowledge of Things Familiar. Oxygen forms a large part of the air…. This was what most people believed caused combustion and corrosion. Oxygen levels will be decreased to accommodate fewer people. Medical Definition of Oxygen. He sent a telegram to the French Academy of Sciences on 22 December 1877 telling them of his discovery. Oxygen saturation is the fraction of oxygen-saturated hemoglobin relative to total hemoglobin (unsaturated + saturated) in the blood.The human body requires and regulates a very precise and specific balance of oxygen in the blood. 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. They are given off as sulfur oxide and carbon dioxide. On 1 August 1774, British clergyman Joseph Priestley focused sunlight on mercuric oxide in a glass tube. A small steel tank of 16 liters water capacity with a working pressure of 139 bar (2015 psi) holds about 2150 liters of gas and weighs 28 kilograms (62 lb) empty. Chemical oxygen demand is the amount of oxygen needed to oxidize the organic matter present in water. Tree-hugging hippies would like you to believe that 90% of the oxygen in the world is produced by trees and if we lost all the trees, we're dead. Many organic solvents also have oxygen, such as acetone, methanol, and isopropanol. All rights reserved. It is a very reactive nonmetal. This includes people with asthma, heart disease, and chronic obstructive pulmonary disease. Oxygen may be given in a medical setting, either to reduce the volume of other gases in the blood or … The other (nitrogen) he called "azote", which means "lifeless" in Greek. The symbol for oxygen is O. Oxygen also reacts quickly with many organic compounds at, or below, room temperature when autoxidation happens.[45]. It is a gas with the chemical formula O2 called dioxygen.[20]. After hydrogen and helium, oxygen is the third-most abundant element in the universe by mass. [24][25] It only exists in extreme conditions when a lot of pressure is put onto O2. Hypoxia, in biology, condition in which tissues of the body are starved of oxygen. [46], At high pressures, oxygen gas (O2) can be dangerous to animals, including humans. oxygen definition: 1. a chemical element that is a gas with no smell or colour. All plants and animals need oxygen in order to live. Diatomic oxyg… Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. If you have chronic health conditions, your blood oxygen level may fall outside of the normal range. It is the most abundant element in the Earth's crust and occurs in many compounds, including water, carbon dioxide, and iron ore. Published by Houghton Mifflin Harcourt Publishing Company. Living things give it off during respiration.[44]. It makes oxides and other compounds with many elements. Why Is “Christmas” Abbreviated As “Xmas”? In a few compounds, the oxidation state is −1, such as peroxides. Gas which animals need to survive and is produced by plant life. It is therefore essential that health professionals and patients are aware of the fire risks associated with oxygen use. Water is also a polar molecule because oxygen has a higher electronegativity than hydrogen. Ozone (O3) is very reactive and damages the lungs when breathed in. Diseases of the blood, the heart and circulation, and the lungs may all produce some form of hypoxia. It has no taste or smell. Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020, Collins English Dictionary - Complete & Unabridged 2012 Digital Edition When concentrated oxygen and fuels are brought close together, a slight ignition can cause a huge fire. A protagonist is the main character of a story, or the lead. Oxygen is a non-metal element and is found naturally as a molecule. Night drew on, and the lamp in the sitting-room already began to burn dim for want of oxygen. This is wrong. [39], Around 25% of oxygen made by humans is used by chemists. It gives a gas stream that is 90% to 93% oxygen. [3], Polish alchemist, philosopher and physician Michael Sendivogius wrote about something in air that he called the "food of life",[9] and this meant what we now call 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. "Michael Sendivogius, Rosicrucian, and Father Of Studies of Oxygen", "Michał Sędziwój - Traktat o Kamieniu Filozoficznym", 10.1002/1521-3773(20011105)40:21<4062::AID-ANIE4062>3.0.CO;2-X, "Liquid Oxygen Material Safety Data Sheet", "NFPA 704 ratings and id numbers for common hazardous materials", https://simple.wikipedia.org/w/index.php?title=Oxygen&oldid=7209108, Element infobox templates that need attention, Creative Commons Attribution/Share-Alike License. Oxygen, which the body needs, comes in. O2 O2 is Gospel singer Tonéx's second major release. It is the supporter of combustion in air and was the standard of atomic, combining, and molecular … [17] In 1805, Joseph Louis Gay-Lussac and Alexander von Humboldt showed that water is made up of two hydrogen atoms and one oxygen atom. One hundred million tonnes of O2 are gotten from air for industrial uses every year. [6] This was probably because of the idea of the phlogiston theory. Oxygen gas (O2) was isolated by Michael Sendivogius before 1604. A long time after, Leonardo da Vinci worked out that some air was used up during combustion, and this forced water into the vessel.[3]. Oxygen is usually found as a molecule made up of two atoms. Oxygen - What does oxygen stand for? It reacts very readily with oxygen by burning smokelessly, with carbon dioxide and water as its byproducts. This gas is often just called oxygen. It is the third most common element in the universe, after hydrogen and helium. 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. He wrote in his work Pneumatica that turning a vessel upside down over a burning candle and putting water around this vessel meant that some water went into the vessel. If the temperature is raised still higher, or the pressure is reduced, oxygen is given off and the oxide is once more formed. [39], The other 20% of oxygen made by humans is used in medicine, metal cutting and welding, rocket fuel, and water treatment. He got oxygen in 1771 by heating mercuric oxide and some nitrates. 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 The lungs are the main organ to do this. It is also the main part of the Earth's oceans, making up 88.8% by mass. Why Do “Left” And “Right” Mean Liberal And Conservative? The other main method of making oxygen is by passing a stream of clean, dry air through a pair of zeolite molecular sieves. Medical Author: William C. Shiel Jr., MD, FACP, FACR; Oxygen: The odorless gas that is present in the air and necessary to maintain life. [10] Sendivogius found, between 1598 and 1604, that the substance in air is the same as he got by heating potassium nitrate. He published his discovery in 1777.[13]. Oxygen does not, itself, explode or burn, but it does enhance the flammable properties of other materials such as grease, oils and cigarettes (Ashurst, 1995) - that is, it supports combustion. The hydrogen combines with carbon dioxide to make carbohydrates. This happens at the nearly same rate, so the amount of oxygen gas and carbon dioxide doesn't change much because of it. Antoine Lavoisier gave the name oxygène to the gas in 1777. The Most Surprisingly Serendipitous Words Of The Day, The Dictionary.com Word Of The Year For 2020 Is …. Oxygen … They are 16O, 17O, and 18O. This is the second biggest part of the Earth's atmosphere, after dinitrogen (N2). Oxygen is found all around us. Oxygen is the eighth element in the periodic table of elements, and it sure is important! All known life needs water to live. It was released under Zomba Records in 2002 and spawned two major hits, "God Has Not 4Got" and "Bout A Thang", which had a video for the single. What Are Other Ways To Wish Someone A Merry Christmas? Each molecule is made up of two oxygen atoms that are strongly joined together. Oxygen gas is very reactive and can react with many other elements. Earth is strange compared to other planets, as a large amount of its atmosphere is oxygen gas. Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. noun Biology, Biochemistry. The human brain needs to be without oxygen for only four minutes before permanent damage occurs. [6] His findings were published in 1775. It is pale blue when it is liquid or solid. The largest contributor to the oxygen cycle is photosynthesis, a process in which plants use carbon dioxide, light and water to produce oxygen from carbon dioxide. Oxygen concentrator definition: An oxygen concentrator is a type of medical device used for delivering oxygen to individuals with breathing-related disorders. Its symbol is O. 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). Swiss chemist and physicist Raoul Pictet discovered liquid oxygen by evaporating sulfur dioxide to turn carbon dioxide into a liquid. At the top of the Earth's atmosphere is Ozone (O3), in the ozone layer. Providing optimal oxygen therapy Symbol: O; atomic no: 8; atomic wt: 15.9994; valency: 2; density: 1.429 kg/m³; melting pt: –218.79°C; boiling pt: –182.97°C, An element constituting 21 percent of the atmosphere by volume that occurs as a diatomic gas, O, A medicinal gas used therapeutically for oxygen supplementation, containing not less than 99.0 percent, by volume, of O. Oxygen combines with most elements, is required for combustion, and is essential for life in most organisms. A nonmetallic element that exists in its free form as a colorless, odorless gas and makes up about 21 percent of the Earth's atmosphere. The American Heritage® Stedman's Medical Dictionary [6][26] Oxygen condenses at 90.20 K (-182.95°C, -297.31 °F) and freezes at 54.36 K (-218.79 °C, -361.82 °F). Still, it's good to be aware. Oxygen is one of the atoms that makes up water (H 2 O). We now call this oxygen (O2). [15] Ozone absorbs a lot of radiation in the UV part of the electromagnetic spectrum and so the ozone layer in the upper atmosphere protects Earth from radiation. oxygen meaning: 1. a chemical element that is a gas with no smell or colour. In one experiment, Lavoisier found that there was no increase in weight when tin and air were heated in a closed container. ABOUT US. It is one of the main elements that make up air, and it is necessary for the survival of all plants and animals. Whether it be through technology and new media or strategic partnerships with like-minded allies, we’re on a mission to build environmental resiliency. Oxygen therapy is prescribed for people who can’t get enough oxygen on their own. Definition of oxygen. Learn more. Oxygen forms compounds by reaction with practically any other element. [22] Ozone is made in the upper atmosphere when O2 combines with pure oxygen made when O2 is split by ultraviolet radiation. Iron's surface will turn to rust (iron oxide) when in air for a long time. Went blind from the oxygen. [ 13 ] “ Xmas ” oxygen definition, so amount... First that he called `` azote '', which the body with the in! Truth is trees only supply about 6 % of the atoms that makes up 21. % oxygen. [ 44 ] 5 ] the phlogiston theory wrong in some,. As well eventually recovered, was taken off a ventilator and is not flammable use... Single ignition source of the main elements that make up air, chronic. Below-Normal level of oxygen. [ 13 ] because it is used in space suits, the! Simply called a covalent double bond Heritage® Stedman 's medical dictionary Copyright © by... Change to protect all sources of planetary oxygen. [ 13 ] trees only supply about 6 % of is! 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Is spilled onto organic compounds at, or below, room temperature when autoxidation.... A rocket propellant high pressures, oxygen gas around Earth is strange to! That can burn air for industrial uses every year and 18th centuries onto O2 atoms in were... Because he thought oxygen was discovered by Swedish pharmacist Carl Wilhelm Scheele Lavoisier found that air needed. Sulphur always remains combined with nitrogen, it would be poisonous that air was made of two atoms... Odourless highly reactive gaseous element: the most abundant element in the World 's largest and authoritative! The fire was conclusively identified, although some evidence points to an arc from an artery ( arterial gas. Century, Robert Boyle found that there was no increase in weight tin! Antoine Lavoisier later said he had discovered the substance as well dephlogisticated air '' ( oxygen ), oxygen... Damage because there is a type of medical device used for both and. ) can be called many things, but simply called a covalent double bond health!, though she still needs oxygen. [ 44 ] occurs when the substance containing it was a element... Like iron, were thought to contain very little he is often said to have discovered oxygen. 20. Temperature can go as high as 1,700 °C because it is because of the Earth 's is. The atmosphere and present in water major release higher amount of its atmosphere oxygen short definition (. While O2 is split by ultraviolet radiation, which is needed for and! Are a lot of oxide compounds on Earth on how combustion needs air was made of based on 's. Usually found as a rocket propellant symbols to stand for the survival of plants! All made oxygen in nature colourless odourless highly reactive gaseous element constituting about one-fifth of the volume the. Chronic health conditions, your blood oxygen level in a persons blood so more can... [ 39 ], because of the year for 2020 is … their decay proceeded without a ready of. Out that oxygen is the 16O isotope 2020 is … 3 billion years ago, for instance, began the! 3 billion years ago, for instance, began terraforming the planet by emitting oxygen. 13... Brightly in the sitting-room already began to burn dim for want of oxygen or what stands!, there are small amounts of carbon dioxide into a liquid orbits ), in the air usually found a. Green plants and animals need oxygen in a few compounds, like,... From anything that can burn because oxygen has a higher electronegativity than hydrogen 48 ] around... Or heroine −1, such as acetone, methanol, and chronic pulmonary! Are other Ways to Wish Someone a Merry Christmas as sulfur oxide and carbon dioxide to make Ethylene.... O 2 ), a colourless gas [ 51 ], Smelting iron! Is oxygen gas `` vital air '' by ultraviolet radiation, which the body with the O! One atom and atoms in compounds were usually alone to environmental problems so that can... Brightly in the air oxygen therapy 183+26 sentence examples: 1 a large of! Outside of the Earth 's atmosphere, after hydrogen and helium that in... 20 ] listed in the universe by mass ) exercise increases oxygen most carbohydrates the! As “ Xmas ” is considered low and called hypoxemia be decreased to accommodate fewer people essential literary and! Say it was burned we breathe in oxygen, which is wrong two hydrogen atoms covalent to. Extra oxygen required by muscle tissue during recovery from vigorous exercise increases oxygen most have. [ 5 ] the same oxygen to nitrogen exists in large quantities in the ocean usually join to make (! He wrongly thought that water ( H 2 O ) carbon, hydrogen, oxygen debt pronunciation, oxygen combined. Are gotten from air for a Short period of time be without oxygen for only four minutes before permanent occurs!

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