what is argon

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It is also used in the semi-conductor industry to provide an inert atmosphere for silicon and germanium crystal growth. Potassium-40 decays to argon-40 and calcium-40, with a half-life of 1.25 billion years. The most abundant isotope is argon-40. More recently, the ratio of argon-39 to argon-40 has been used in precision dating. Used in conjunction with a special low-E (short for low emissivity) glass coating, argon gas windows bring the temperature of the window closer to room temperature. Updates? Improvement, But Not Dramatically It accesses the memory array in a password independent order. In drie stappen het juiste beschermgas voor de beste las His work was forgotten until Lord Rayleigh, more than a century later, found that nitrogen prepared by removing oxygen from air is always about 0.5 percent more dense than nitrogen derived from chemical sources such as ammonia. As a result of its unreactiveness, argon is used in light bulbs to protect the filament and to provide an unreactive atmosphere in the vicinity of welding. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. Argon is an odourless gas. As such, argon does not conduct heat as well as the surrounding air, as it takes more energy for heat to pass through it. Define argon. で、その容量パーセント濃度は0.93%である。地球上のアルゴンのほとんどは、質量数が40のもの(アルゴン40)であり、これは地殻中のカリウム40の崩壊により生成した。一方、宇宙においてはアルゴン36が最も多量に存在し、超新星爆発による元素合成により生成された。, 空気中(地表)に 0.93% 含まれているので、アルゴンは空気から液体酸素・液体窒素を分離精製する際に、酸素から分留して得ることができる。, 貴ガスの中では最も空気中での存在比が大きく、乾燥空気を構成する物質では第2位の酸素の 20.93% についで第3位の 0.93% である。空気中のアルゴンの存在比が貴ガス中最も大きいのは、自然界すなわち岩石中に存在していたカリウム40の一部 (11%) が電子捕獲によってアルゴン40となったためである。このため地球および火星など岩石惑星大気中ではアルゴン40の同位体比が圧倒的に大きいのに対し、太陽大気中ではアルゴン36の同位体が大部分を占める[5]。第4位は二酸化炭素だが、2008年現在得られる資料では 0.038% であり3位との差は大きい。, 名の通り、アルゴンは化学反応をほとんど起こさない元素である。最外殻電子数が8でありオクテット則を満たしているので、アルゴンは安定でほかの元素と結合しにくい。三重点は83.8058 Kであり、これは1990年に国際温度目盛 (ITS-90) の定義定点に採用された。[6]。, 貴ガスの一つ。常温、常圧で無色、無臭の気体。貴ガスのため不活性である。比重は、1.65(−233 ℃: 固体)、1.39(−186 ℃: 液体)、空気に対する比重は、1.38。固体での安定構造は、面心立方構造 (FCC)。, 産業用途としては主に反応性の低さを利用した不活性ガスとして製鋼や溶接、シリコン製造に用いられる[7]。アルゴンの2004年度日本国内生産量は219,461,000 m3 (約40万トン)、工業消費量は38,348,000 m3である。近年の需要に対応して、2005年に日本工業規格 (JIS K 1105) が改正され、純度が高められた。, 1892年にレイリー卿(ジョン・ウィリアム・ストラット)が大気分析の過程で未知の気体に気づき、1894年にウィリアム・ラムゼーと共にその正体がアルゴンであることを突き止めた[10]。しかし、その100年も前に、ヘンリー・キャヴェンディッシュが存在に気がついていたと言われている。なお、1904年にレイリー卿は「気体の密度に関する研究、およびこの研究により成されたアルゴンの発見」によりノーベル物理学賞を、ウィリアム・ラムゼーは「空気中の希ガス元素の発見と周期律におけるその位置の決定」によりノーベル化学賞を、それぞれ授与された。, アルゴンは単原子でオクテット則を満たしていることから、他の原子と結合した化合物は長い間知られていなかった。2000年、フィンランドの研究者により初のアルゴン化合物、アルゴンフッ素水素化物 (HArF) の合成が発表された。これは、アルゴンとフッ化水素、ヨウ化セシウムを混合して 7.5 K で紫外線照射することにより合成された[11]。. Argon was suspected to be present in air by Henry Cavendish in 1785 but wasn't discovered until 1894 by Lord Rayleigh and Sir William Ramsay. Argon2d maximizes resistance to GPU cracking attacks. Block. A double-pane argon filled window will have a U-value of .25, while a double-pane air-filled window has a U-value of .30. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Although argon is non-toxic, it is considerably more dense than air. Refill is $65 CAD. It is used in the production of titanium. Argon is an inexpensive, non-toxic, colorless, and odorless gas that occurs naturally and constitutes less than 1 percent of Earth's atmosphere. Argon is the third element of the eighteenth column of the period table. It is a noble gas and it is the third most abundant gas in earth’s atmosphere. Argon is used in medical lasers, in ophthalmology for example to correct eye defects such as blood vessel leakage, retinal detachment, glaucoma and macular degeneration. As befits an element that flies under the chemical and physical radar unless provoked, it is colorless, odorless and tasteless. Argon is a versatile industrial gas used in welding applications, such as the welding of specialty alloys, and in the production of light bulbs and lasers. Argon tubes are used for advertising (deep blue-azure color). Corrections? Khriachtchev, L.; Pettersson, M.; Runeberg, N.; Lundell, J.; Räsänen, M. Magnetic susceptibility of the elements and inorganic compounds, http://www.rsc.org/chemistryworld/podcast/interactive_periodic_table_transcripts/argon.asp, 歴史溶岩のアルゴン同位体比 ―若い火山岩のK-Ar年代測定における初生値補正の重要性―, https://ja.wikipedia.org/w/index.php?title=アルゴン&oldid=80403043, 溶岩が噴出冷却してから現在まで岩石サンプルの閉鎖系が保たれ、カリウム及びアルゴンの出入りがない). What is Argon? Argon Medical Devices buys Angiotech's interventional biz The maps are then integrated with Argon 's handheld simulators, so that when a student enters a … How well do you know their symbols? Argon gas is quite viscous when compared to other gases, and moves around rather slowly. Navigate parenthood with the help of the Raising Curious Learners podcast. The atomic number of each element increases by one, reading from left to right. Used as an alternative to cauterizing blood vessels or using a laser, the process involves the use of a probe that fires argon gas, which closes an electrical current when it … Interesting Facts about Argon. Argon gas condenses to a colourless liquid at −185.8 °C (−302.4 °F) and to a crystalline solid at −189.4 °C (−308.9 °F). Argon is a chemical element with the symbol Ar and atomic number 18. Argon gas is used to increase the energy efficiency and general performance of thermal windows. Symbol: Ar; atomic number: 18 To fill the panes, argon is pumped in via a small hole along the spacer, while air is allowed to escape out). Argon is frequently used when an inert atmosphere is needed. Argon is an inert, colorless and odorless element — one of the Noble gases. Uses Of Argon. It is classified as a noble gas.The argon atom has 18 electrons and 18 protons. Among the noble gases, it is generally considered to be the most abundant, and it is sometimes used to replace other noble gases in situations where an inert gas in needed. That means in the winter unwelcomed cold is limited from entering your home while the warmth of the furnace stays put and in the summer, the heat is limited from entering your home while the conditioned air stays put. A laser is a device that produces very bright light of a single color (frequency). Argon has no known biological functions. Regardless of … Argon is a colorless gas. Argon is frequently used when an inert atmosphere is needed. Argon is the third noble gas, in period 8, and it makes up about 1% of the Earth's atmosphere. The noble gases are colourless, odourless, tasteless, nonflammable gases. The outermost (valence) shell of argon has eight electrons, making it exceedingly stable and, thus, chemically inert. Please add to it, or discuss it at the Etymology scriptorium.) Argon er det tredje grundstof i hovedgruppe 8, ædelgasserne. Argon is colorless and odorless Argon has no sence of feel. The periodic table is made up of 118 elements. This is one of the most commonly used standards for the gas and is also one of the most efficient Argon that welders can use. Due to its density, Argon gas is better at insulating compared to plain air, which is why energy-efficient windows utilize Argon Gas between the panes of glass. It has the atomic number 18 and is a noble gas. The laser shines a blue-green light on the affected area of the skin.

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