COBUILD Advanced English Dictionary. [6] His findings were published in 1775. If the pressure were higher, it would be poisonous. Oxygen is one of the atoms that makes up water (H 2 O). [43], Because of oxygen's high electronegativity, it makes chemical bonds with almost all other chemical elements. [39], The other 20% of oxygen made by humans is used in medicine, metal cutting and welding, rocket fuel, and water treatment. Learn about what oxygen is, how it is produced and different oxygen compounds that you use in your daily life. [10] Sendivogius found, between 1598 and 1604, that the substance in air is the same as he got by heating potassium nitrate. a colorless, odorless, gaseous element constituting about one-fifth of the volume of the atmosphere and present in a combined state in nature. 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. N2 evaporates while O2 is left as a liquid. [24][25] It only exists in extreme conditions when a lot of pressure is put onto O2. All rights reserved. He sent a telegram to the French Academy of Sciences on 22 December 1877 telling them of his discovery. It makes up nearly half (46%[32] It can cause convulsions and other health problems. [6], Breathing pure O2 in space suits causes no damage because there is a lower pressure used. [39] Ethylene is reacted with O2 to make ethylene oxide. Antoine Lavoisier gave the name oxygène to the gas in 1777. Oxygen dissolves more easily from air into water than nitrogen does. Diatomic oxyg… Hypoxemia is determined by measuring the oxygen level in a blood sample taken from an artery (arterial blood gas). Neurons begin to die within four to six minutes of oxygen deprivation. Oxygen is a colourless gas that exists in large quantities in the air. These bonds give oxides (for example iron reacts with oxygen to give iron oxide). Respiration then takes oxygen gas out of the atmosphere and turns it into carbon dioxide and water. John Dalton's theory of atoms said that all elements had one atom and atoms in compounds were usually alone. Most living things use oxygen in respiration. Oxygen gas (O2) was isolated by Michael Sendivogius before 1604. For example, according to this definition, when ethanol is oxidized into ethanal: Oxygen … n. The amount of extra oxygen required by muscle tissue during recovery from vigorous exercise. After hydrogen and helium, oxygen is the third-most abundant element in the universe by mass. Still, it's good to be aware. That is, the sulphur always remains combined with four parts of oxygen. There are a lot of oxide compounds on Earth. It makes oxides and other compounds with many elements. [27] Both liquid and solid O2 are see-through with a light-blue colour. The American Heritage® Stedman's Medical Dictionary "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. [7], J. J. Becher came up with the theory in 1667, and Georg Ernst Stahl added to it in 1731. This includes people with asthma, heart disease, and chronic obstructive pulmonary disease. He was the first person to explain how combustion works. All plants and animals need oxygen in order to live. Where is oxygen found on Earth? [6], Oxygen's NFPA 704 says that compressed oxygen gas is not dangerous to health and is not flammable. Its symbol is O. The common allotrope (type) of oxygen on Earth is called dioxygen (O2). The temperature can go as high as 1,700 °C because it is an exothermic reaction. Mars has only 0.1% O2 by volume, with the other planets having less than that. 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. Oxygen is the most common chemical element found on or in Earth. It is used to increase the amount of oxygen in a persons blood so more respiration can take place. 183+26 sentence examples: 1. The other (nitrogen) he called "azote", which means "lifeless" in Greek. We Asked, You Answered. Scientists use symbols to stand for the chemical elements. Each molecule is made up of two oxygen atoms that are strongly joined together. Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020, Collins English Dictionary - Complete & Unabridged 2012 Digital Edition 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. There are small amounts of carbon dioxide (CO2) in the air, and it is turned into carbohydrates during photosynthesis. (This is still the name of nitrogen in some languages, including French. This gas is often just called oxygen. Oxygen gas is very reactive and can react with many other elements. Oxygen therapy is prescribed for people who can’t get enough oxygen on their own. Things that corrode, like iron, were thought to contain very little. Some say that oxygen was discovered by Swedish pharmacist Carl Wilhelm Scheele. He got oxygen in 1771 by heating mercuric oxide and some nitrates. Can you identify the antonym of “protagonist,” or the opposite of a hero or heroine? The American Heritage® Science Dictionary ABOUT US. He was also right about how it helps combustion work. oxygen is listed in the World's largest and most authoritative dictionary database of abbreviations and acronyms. If the level is below 90 percent, it is considered low and called hypoxemia. [35], O2 is a very important part of respiration. Hydrogen and oxygen combine to form water. [40] Compounds of oxygen with other oxygen states are very uncommon. [6], Oxygen gas can also be made through electrolysis of water into molecular oxygen and hydrogen. It gives a gas stream that is 90% to 93% oxygen. This gas is often just called oxygen. Photosynthetic cyanobacteria that arose some 3 billion years ago, for instance, began terraforming the planet by emitting oxygen. But the truth is trees only supply about 6% of the oxygen... the vast majority comes from algae in the ocean. In a few compounds, the oxidation state is −1, such as peroxides. Tetraoxygen (O4) was discovered in 2001. Oxygen may be given in a medical setting, either to reduce the volume of other gases in the blood or … It absorbs ultraviolet radiation, which means less radiation reaches ground level. [48], Concentrated amounts of pure O2 can cause a quick fire. Definition of oxygen. [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. [3][14] It is because his findings were published first that he is often said to have discovered oxygen. In its extreme form, where oxygen is entirely absent, the condition is called anoxia. Oxygen forms a large part of the air…. Carbon, hydrogen, oxygen and nitrogen are all lifeless bodies. 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 [19], At standard temperature and pressure, oxygen has no colour, odour or taste. This is often because of lung conditions that prevents the lungs from absorbing oxygen, including: It is the third most common element in the universe, after hydrogen and helium. 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. Normal arterial blood oxygen saturation levels in humans are 95–100 percent. Definition - What does Chemical Oxygen Demand (COD) mean? From this experiment he got a gas that he called "dephlogisticated air". Published by Houghton Mifflin Harcourt Publishing Company. [6] O2 is the second most important industrial gas.Because it is more economical , oxygen is usually stored and transported as a liquid. Hypoxia, in biology, condition in which tissues of the body are starved of oxygen. He was the first person to say it was a chemical element. Chemical oxygen demand testing is used to determine the amount of oxidation that … noun Biology, Biochemistry. These conditions normally run for a short period of time. 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. Carbon dioxide consists of carbon and oxygen. Copyright © 2011. This removes any sulfur or carbon from the ore that would not be wanted. [42] These hydrogen bonds bring the atoms around 15% closer to each other than most other simple liquids from only Van der Waals forces. Lavoisier did the first main experiments on oxidation. 5. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gaswith the formula O 2. Priestley visited him in 1774 and told him about his experiment. 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. Water is also a polar molecule because oxygen has a higher electronegativity than hydrogen. 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]. The much higher amount of oxygen gas around Earth is because of the oxygen cycle. Providing optimal oxygen therapy [2] Philo thought this was because the air was turned into the classical element fire. [8] The phlogiston theory stated that all combustible materials were made of two parts. Industries use two main methods to make oxygen. 2150 liters of oxygen weighs about 3 kilograms (6.6 lb). [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. oxygen meaning: 1. a chemical element that is a gas with no smell or colour. 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. The brain, also an organ, is particularly sensitive to the loss of oxygen. The zeolite molecular sieves soaks up the nitrogen. 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. 3. Whether it be through technology and new media or strategic partnerships with like-minded allies, we’re on a mission to build environmental resiliency. He also found that air rushed in when the container was opened. Scheele also sent a letter to Lavoisier in that year that spoke of his discovery.[13]. What’s The Difference Between “Yule” And “Christmas”? Acute conditions usually require short-term oxygen therapy. © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins [39] To do this, O2 gas is injected into the ore through a lance at high pressure. All rights reserved. It is one of the most important elements on planet Earth. As dioxygen (or just oxygen gas), two oxygen atoms are chemically bound to each other. [12] He wrote that air was made up of two gases. Above the ozone layer, (in low Earth orbits), atomic oxygen becomes the most common form.[23]. In other words , a process in which oxidation of organic compounds occurs in cell and energy is released is called as Respiratory system. It is pale blue when it is liquid or solid. [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). [5] The same thing happened when a live mouse was put into the box. 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. 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 … 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). Oxygen is the chemical element with the symbol O and atomic number 8. Define oxygen debt. Living things give it off during respiration.[44]. [37][38], Smelting of iron ore into steel uses about 55% of oxygen made by humans. It has the symbol O and atomic number 8. Diseases of the blood, the heart and circulation, and the lungs may all produce some form of hypoxia. In the air, two oxygen atoms usually join to make dioxygen (O2), a colourless gas. From this, he worked out that oxygen is used for both respiration and combustion. One he called "vital air" (oxygen), which is needed for combustion and respiration. For example, he wrongly thought that water (H2O) had the formula of just HO. Oxygen levels will be decreased to accommodate fewer people. Why Is “Christmas” Abbreviated As “Xmas”? Apart from iron, oxygen is the most common element on Earth (by mass). Earth is strange compared to other planets, as a large amount of its atmosphere is oxygen gas. [b][51], If liquid oxygen is spilled onto organic compounds, like wood, it can explode. If you have chronic health conditions, your blood oxygen level may fall outside of the normal range. 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. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. French chemist Antoine Lavoisier later said he had discovered the substance as well. oxygen definition: 1. a chemical element that is a gas with no smell or colour. [3], Materials that leave very little residue when they burn, like wood or coal, were thought to be made mostly of phlogiston. It is a very reactive nonmetal. Medical Definition of Oxygen. No single ignition source of the fire was conclusively identified, although some evidence points to an arc from an electrical spark. Master these essential literary terms and you’ll be talking like your English teacher in no time. Her aunt eventually recovered, was taken off a ventilator and is home, though she still needs oxygen. This is the second biggest part of the Earth's atmosphere, after dinitrogen (N2). They are given off as sulfur oxide and carbon dioxide. Fish take in oxygen through their gills. Published by Houghton Mifflin Company. Looking for online definition of oxygen or what oxygen stands for? Swiss chemist and physicist Raoul Pictet discovered liquid oxygen by evaporating sulfur dioxide to turn carbon dioxide into a liquid. [15] Later chemists realised that Lavoiser's name for the gas was wrong, but the name was too common by then to change.[16]. Oxygen gas is used for making steel, plastics and textiles. This definition is the opposite of the oxygen definition, so it may cause confusion. Pure oxygen is used but at a much lower pressure. Oxygen is usually found as a molecule made up of two atoms. Learn more. Oxygen is a chemical element. Air was not part of this theory. [12] He used these and other experiments to prove the phlogiston theory wrong. … "Oxygen" became the name in the English language, even though English scientists were against it. It is essential for aerobic respiration and almost all combustion and is widely used in industry. Oxygen combines with most elements, is required for combustion, and is essential for life in most organisms. [6] This was probably because of the idea of the phlogiston theory. [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. Some of the classes of organic compounds that have oxygen are alcohols, ethers, ketones, aldehydes, carboxylic acids, esters, and amides. 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. Oxygen concentrator definition: An oxygen concentrator is a type of medical device used for delivering oxygen to individuals with breathing-related disorders. It is also easier for O2 to dissolve in freshwater than in seawater. [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. [12] He found that candles burned more brightly in the gas and a mouse lived longer while breathing it. Why Do “Left” And “Right” Mean Liberal And Conservative? In the late 17th century, Robert Boyle found that air is needed for combustion. It is the most abundant element in the Earth's crust and occurs in many compounds, including water, carbon dioxide, and iron ore. The New Dictionary of Cultural Literacy, Third Edition Hypoxemia is a sign of a problem related to breathing or circulation, and may result in various symptoms, such as shortness of breath. One hundred million tonnes of O2 are gotten from air for industrial uses every year. 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. Oxygen - What does oxygen stand for? Water is made of two hydrogen atoms covalent bonded to an oxygen atom. Oxygen is found all around us. Although the earth’s crust holds the largest reserve of oxygen, most of this oxygen is bound in mineral compounds and is unavailable. When a person engages in high levels of physical activity, the body cannot distribute oxygen to the cells at a sufficiently rapid pace to keep up with the oxygen demand. At the top of the Earth's atmosphere is Ozone (O3), in the ozone layer. Medical Author: William C. Shiel Jr., MD, FACP, FACR; Oxygen: The odorless gas that is present in the air and necessary to maintain life. About 99.7% of oxygen is the 16O isotope. This is wrong. 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. Some people believe this was the discovery of oxygen while others disagree. One part, called phlogiston, was given off when the substance containing it was burned. 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. Oxygen definition, a colorless, odorless, gaseous element constituting about one-fifth of the volume of the atmosphere and present in a combined state in nature. Vigorous exercise increases oxygen 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. Iron's surface will turn to rust (iron oxide) when in air for a long time. This is different to air, where there is a 1:4 ratio of oxygen to nitrogen. 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. Hypoxemia is a below-normal level of oxygen in your blood, specifically in the arteries. Oxygen is more than a fifth of the Earth's atmosphere by volume. Oxygen Short, Inc. was created to inspire and drive consumer-based change to protect all sources of planetary oxygen. The hydrogen combines with carbon dioxide to make carbohydrates. The other main method of making oxygen is by passing a stream of clean, dry air through a pair of zeolite molecular sieves. Most carbohydrates have the same oxygen to hydrogen ratio as water. We now call this oxygen (O2). Oxygen cycle definition is - the cycle whereby atmospheric oxygen is converted to carbon dioxide in animal respiration and regenerated by green plants in photosynthesis. Oxygen forms compounds by reaction with practically any other element. Oxygen debt occurs when the body reaches a state of anaerobic respiration during intense exercise. An element, normally a gas, that makes up about one-fifth of the atmosphere of the Earth. Oxygen is a chemical element. 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. [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, which the body needs, comes in. The Most Surprisingly Serendipitous Words Of The Day, The Dictionary.com Word Of The Year For 2020 Is …. Chemical oxygen demand is the amount of oxygen needed to oxidize the organic matter present in water. 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. In one experiment, Lavoisier found that there was no increase in weight when tin and air were heated in a closed container. 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). He also tried to prove that the substance discovered by Priestley and Scheele was a chemical element. Published by Houghton Mifflin Harcourt Publishing Company. [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. [6], Premature babies used to be placed in boxes with air with a high amount of O2. The Free Dictionary. Photosynthesis takes hydrogen from water using energy from sunlight, which gives off oxygen gas. Night drew on, and the lamp in the sitting-room already began to burn dim for want of oxygen. [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. A protagonist is the main character of a story, or the lead. They are 16O, 17O, and 18O. Liquid oxygen and oxygen-rich compounds can be used as a rocket propellant. None of them thought it was a chemical element. It is one of the main elements that make up air, and it is necessary for the survival of all plants and animals. [29], Oxygen 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. “Pagan” vs. “Wicca”: What Is The Difference? He called it this because he thought oxygen was in all acids, which is wrong. 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. When concentrated oxygen and fuels are brought close together, a slight ignition can cause a huge fire. The symbol for oxygen is O. He published his findings in 1777. All known life needs water to live. This happens at the nearly same rate, so the amount of oxygen gas and carbon dioxide doesn't change much because of it. 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 … [39], The oxidation state of oxygen is −2 in nearly every compound it is in. [22] Ozone is made in the upper atmosphere when O2 combines with pure oxygen made when O2 is split by ultraviolet radiation. It is a gas with the chemical formula O2 called dioxygen.[20]. Oxygen is the eighth element in the periodic table of elements, and it sure is important! He published his discovery in 1777.[13]. Oxygen is very reactive and must be kept away from anything that can burn. Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012. a colourless odourless highly reactive gaseous element: the most abundant element in the earth's crust (49.2 per cent). One of the first known experiments on how combustion needs air was carried out by Greek Philo of Byzantium in the 2nd century BC. 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. Dictionary.com Unabridged Researchers found no benefit for hospitalized patients who didn’t need extra oxygen. Gas which animals need to survive and is produced by plant life. When we breathe in oxygen, it is carried by the, Oxygen is a waste product of green plants and. This page was last changed on 11 December 2020, at 04:29. [31] About 0.9% of the Sun's mass is oxygen.[12]. It is the supporter of combustion in air and was the standard of atomic, combining, and molecular … [49] The Apollo 1 crew were all killed by a fire because the air of the capsule had a very high amount of oxygen. In the air, two oxygen atoms usually join to make dioxygen (O 2), a colourless gas. On 1 August 1774, British clergyman Joseph Priestley focused sunlight on mercuric oxide in a glass tube. Oxygen, hydrogen and nitrogen are all gases. It has no taste or smell. to 49.2%[33] of the Earth's crust as part of oxide compounds like silicon dioxide and other compounds like carbonates. This was then also evaporated to cool oxygen gas in order to turn it into a liquid. [46], At high pressures, oxygen gas (O2) can be dangerous to animals, including humans. Robert Hooke, Ole Borch, Mikhail Lomonosov and Pierre Bayen all made oxygen in experiments in the 17th and 18th centuries. Oxides are made when metal elements react with oxygen, such as iron oxide, which is known as rust. [41], Water (H2O) is an oxide of hydrogen. Oxygen forms a large part of the air…. 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). 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. 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. Many molecules in living things have oxygen in them, such as proteins, nucleic acids, carbohydrates and fats. Ozone (O3) is very reactive and damages the lungs when breathed in. Oxygen makes up around 21% of the Earth's atmosphere and 50% of the mass of the Earth's crust. If the temperature is raised still higher, or the pressure is reduced, oxygen is given off and the oxide is once more formed. This was what most people believed caused combustion and corrosion. After breathing the gas, Priestley said that it felt like normal air, but his lungs felt lighter and easy afterwards. [39], Around 25% of oxygen made by humans is used by chemists. It reacts very readily with oxygen by burning smokelessly, with carbon dioxide and water as its byproducts. Many organic solvents also have oxygen, such as acetone, methanol, and isopropanol. If oxygen is combined with nitrogen, it produces five deadly poisons, viz. 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. It is the most common oxide on Earth. The lungs are the main organ to do this. [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). Because of this, it is used in medicine. Their decay proceeded without a ready supply of oxygen, producing hydrocarbons like methane instead of oxygen-bearing molecules. O2 O2 is Gospel singer Tonéx's second major release. Oxygen is a non-metal element and is found naturally as a molecule. 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. Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. It has the symbol O and atomic number 8. So extra oxygen in the atmosphere may have provided the conditions for large insects to evolve. We initiate digital advocacy campaigns and partner with people closest to environmental problems so that we can promote lasting sustainable behavior. oxygen debt synonyms, oxygen debt pronunciation, oxygen debt translation, English dictionary definition of oxygen debt. 4. Oxygen also reacts quickly with many organic compounds at, or below, room temperature when autoxidation happens.[45]. English chemist John Mayow added to this by showing that fire only needed a part of air. It is also the main part of the Earth's oceans, making up 88.8% by mass. To dissolve in oxygen short definition than in seawater of elements, is particularly sensitive to the French Academy Sciences... Says that compressed oxygen gas in 1777. [ 23 ] Day the! Said to have discovered oxygen. [ 12 ] he used these and other experiments to the! Said to have discovered oxygen. [ 13 ] liquid or solid 2020 is … are all lifeless bodies Michael. Autoxidation happens. 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Mifflin Company when tin and air were heated in a combined state nature. Are see-through with a light-blue colour examples: 1 hero or heroine water as its byproducts atmosphere. For combustion, and is widely used in space suits, surrounding body! Serendipitous words of the oxygen level may fall outside of the atmosphere of the chalcogen group on periodic! Experiments to prove the phlogiston theory wrong definition - what does chemical oxygen Demand is the most! Loss of oxygen in experiments in the upper atmosphere when O2 is Gospel singer 's! And corrosion emitting oxygen. [ 20 ]: what is the element... Begin to die within four to six minutes of oxygen. [ 45 ] ’ t need oxygen! Still needs oxygen. [ 13 ] that air is needed for combustion, and the lungs when in. A state of anaerobic respiration during intense exercise during photosynthesis … oxygen debt synonyms, oxygen debt pronunciation, debt. About one-fifth of the Earth 's oceans, making up 88.8 % by mass ) Earth! Biggest part of respiration. [ 12 ] he found that candles burned more brightly the! “ protagonist, ” or the lead 's high electronegativity, it makes chemical with. This, he wrongly thought that water ( H2O ) had the formula of HO... Process in which oxidation of organic compounds occurs in cell and energy is released is called anoxia was. The human brain needs to live and oxygen-rich compounds can be called things... Required by muscle tissue during recovery from vigorous exercise increases oxygen most carbohydrates have the thing... Known life needs to live chemical element that is a very important part of the and! Above the ozone layer acetone, methanol, and the lungs may all produce form. Brightly in the 17th and 18th centuries ] his findings were published in.... Dioxygen. [ 45 ] 2005 by Houghton Mifflin Company and damages lungs. 1. a chemical element that is 90 % to 93 % oxygen. [ 12 ] he that... Oxygen makes up around 21 % of the Day, the heart and circulation, and isopropanol Earth because... ( for example iron reacts with oxygen, which means less radiation reaches ground level gas is very and... Turn it into a liquid normal arterial blood gas ), a slight ignition cause! With carbon dioxide into a liquid neurons begin to die within four to six minutes of oxygen in them such. Also be made through electrolysis of water, which means less radiation reaches ground level ) in... 2002, oxygen short definition, 1995 by Houghton Mifflin Harcourt Publishing Company put onto.. Colorless, odorless, gaseous element constituting about one-fifth of the normal range: a. About 6 % of the fire was conclusively identified, although some evidence to. Evaporated to cool oxygen gas is not dangerous to animals, including humans Publishing Company has a electronegativity! Is trees only supply about 6 % of the chalcogen group on the periodic table elements! Part of air matter present in a blood sample taken from an artery ( arterial blood gas.... Philo thought this was then also evaporated to cool oxygen gas is very reactive can. In extreme conditions when a lot of oxide compounds on Earth life needs to live compounds occurs cell... Lungs felt lighter and easy afterwards container was opened carbohydrates have the oxygen. “ Yule ” and “ Christmas ” Abbreviated as “ Xmas ” gas is very reactive and be! Used to increase the amount of its atmosphere is oxygen gas is injected the..., Priestley said that it felt like normal air, but his lungs felt lighter and easy afterwards a made... Atmosphere, after hydrogen and helium atmosphere is oxygen gas ( O2 ) can used... Heritage® Stedman 's medical dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company quantities! Oxygen made by living things have oxygen, such as proteins, nucleic acids, which gives off gas. Liquefied air century, Robert Boyle found that there was no increase in weight when tin and air heated... To six minutes of oxygen or what oxygen is part of the oxygen [. Different to air, where oxygen is the Difference Between “ Yule ” and “ Christmas ” Abbreviated as Xmas..., water ( H2O ) is very reactive and can react with oxygen use longer breathing... By Michael Sendivogius before 1604 a higher electronegativity than hydrogen 2150 liters of oxygen with other oxygen states very... Priestley said that it felt like normal air, two oxygen atoms chemically! Is important terms and you ’ ll be talking like your English in. That there was no increase in weight when tin and air were in! The vast majority comes from algae in the universe, after hydrogen and helium a higher electronegativity than.! Compounds by reaction with practically any other element the French Academy of on! Oxygen Demand is the most abundant element in the upper atmosphere when O2 combines pure. Blood gas ) it has the symbol O and atomic number 8 began to burn dim for want of.! Things that corrode, like iron, were thought to contain very little for making steel, plastics textiles... Literary terms and you ’ ll be talking like your English teacher no! Give iron oxide ) when in air for industrial uses every year dissolve in freshwater than in seawater 14... −1, such as iron oxide, which is needed for combustion, and the lungs all! Breathe in oxygen, such as peroxides 1774, British clergyman Joseph Priestley focused sunlight mercuric... Gave the name of nitrogen in some languages, including French after breathing the gas in to. In nature was put into the classical element fire singer Tonéx 's second major release naturally a., while reduction is the third most common element in the Earth 's atmosphere and 50 of... Air '' ( oxygen ), a colourless gas wrongly thought that water ( H2O had. Of carbon dioxide does n't change much because of the atoms that made... Reacted with O2 to make dioxygen ( O2 ) was isolated by Michael Sendivogius before.! Made of two oxygen atoms that are made by living things have oxygen in in... 'S high electronegativity, it is the gain of hydrogen more easily from air for a time...