25 Dec

oxygen short definition

None of them thought it was a chemical element. On 1 August 1774, British clergyman Joseph Priestley focused sunlight on mercuric oxide in a glass tube. From this experiment he got a gas that he called "dephlogisticated air". Oxygen is a chemical element. For example, he wrongly thought that water (H2O) had the formula of just HO. [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. [31] About 0.9% of the Sun's mass is oxygen.[12]. 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. Robert Hooke, Ole Borch, Mikhail Lomonosov and Pierre Bayen all made oxygen in experiments in the 17th and 18th centuries. 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. This bond can be called many things, but simply called a covalent double bond. a colorless, odorless, gaseous element constituting about one-fifth of the volume of the atmosphere and present in a combined state in nature. One he called "vital air" (oxygen), which is needed for combustion and respiration. Pure oxygen is used but at a much lower pressure. According to this definition, oxidation is the loss of hydrogen, while reduction is the gain of hydrogen. This was then also evaporated to cool oxygen gas in order to turn it into a liquid. Each molecule is made up of two oxygen atoms that are strongly joined together. Many organic compounds have oxygen in them. In other words , a process in which oxidation of organic compounds occurs in cell and energy is released is called as Respiratory system. Some say that oxygen was discovered by Swedish pharmacist Carl Wilhelm Scheele. Learn more. 5. It has the symbol O and atomic number 8. (This is still the name of nitrogen in some languages, including French. The common allotrope (type) of oxygen on Earth is called dioxygen (O2). Air was not part of this theory. noun Biology, Biochemistry. [27] Both liquid and solid O2 are see-through with a light-blue colour. Whether it be through technology and new media or strategic partnerships with like-minded allies, we’re on a mission to build environmental resiliency. [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. Living things give it off during respiration.[44]. An element, normally a gas, that makes up about one-fifth of the atmosphere of the Earth. [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. No single ignition source of the fire was conclusively identified, although some evidence points to an arc from an electrical spark. It is the most common oxide on Earth. It is also the main part of the Earth's oceans, making up 88.8% by mass. Definition - What does Chemical Oxygen Demand (COD) mean? Most carbohydrates have the same oxygen to hydrogen ratio as water. He was the first person to explain how combustion works. All known life needs water to live. [35], O2 is a very important part of respiration. [8] The phlogiston theory stated that all combustible materials were made of two parts. Although the earth’s crust holds the largest reserve of oxygen, most of this oxygen is bound in mineral compounds and is unavailable. 183+26 sentence examples: 1. Lavoisier did the first main experiments on oxidation. Oxygen is also found in nearly all biomolecules that are made by living things. 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 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. By 1811, Amedeo Avogadro correctly worked out what water was made of based on Avogadro's law. Swiss chemist and physicist Raoul Pictet discovered liquid oxygen and hydrogen Between “ Yule ” “! Each other only four minutes before permanent damage occurs Avogadro correctly worked what. Terraforming the planet by emitting oxygen. [ 20 ] around 21 % of oxygen gas out the! Into molecular oxygen and nitrogen are all lifeless bodies methane instead of molecules... 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