It accesses the memory array in a password independent order. Phase at room temperature: Gas 6. A vertical column in the periodic table. Argon gas is used in graphite electric burners to prevent the graphite from burning. Argon is colorless and odorless Argon has no sence of feel. It also is widely utilized as an inert atmosphere for arc-welding metals, such as aluminum and stainless steel; for the production and fabrication of metals, such as titanium, zirconium, and uranium; and for growing crystals of semiconductors, such as silicon and germanium. It is based on the Nordic nRF52840 and has built-in battery charging circuitry so it’s easy to connect a Li-Po and deploy your local network in minutes. 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. When used as a fill layer in dual or triple-paned windows, argon gas is an effective insulator. What is Argon? It has the atomic number 18 and is a noble gas. Argon gas is used to increase the energy efficiency and general performance of thermal windows. How? In drie stappen het juiste beschermgas voor de beste las English Language Learners Definition of argon : a chemical element that is a colorless gas and that is used in various products (such as lasers and some electric light bulbs) See the full definition for argon in the English Language Learners Dictionary The following uses for argon are gathered from a number of sources as well as from anecdotal comments. Atomic weight (average mass of the atom): 39.948 4. According to the Jefferson National Linear Accelerator Laboratory, the properties of argon are: 1. This article was most recently revised and updated by, https://www.britannica.com/science/argon-chemical-element, argon - Student Encyclopedia (Ages 11 and up). Articles from Britannica Encyclopedias for elementary and high school students. Argon definition is - a colorless odorless inert gaseous element found in the air and in volcanic gases and used especially in welding, lasers, and electric bulbs. Symbol: Ar; atomic number: 18 Let us know if you have suggestions to improve this article (requires login). Argon is a colorless gas. 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 is the third noble gas, in period 8, and it makes up about 1% of the Earth's atmosphere. Argon atoms are found in air. Improvement, But Not Dramatically Group. This entry needs pronunciation information. Colourless, odourless, and tasteless, argon gas was isolated (1894) from air by the British scientists Lord Rayleigh and Sir William Ramsay. The argon laser targets a precise area and offers a great advantage over other therapies. To put the gasses' numbers in perspective, consider copper's sky-high thermal conductivity rating of 401. A horizontal row in the periodic table. A major portion of terrestrial argon has been produced, since the Earth’s formation, in potassium-containing minerals by decay of the rare, naturally radioactive isotope potassium-40. アルゴン(英: argon)は原子番号18番の元素である。元素記号は Ar。原子量は39.95。第18族元素(貴ガス)、第3周期元素の一つ。, 「アルゴン」という名はギリシャ語で「怠惰な」「不活発な」を意味する「αργον」という単語に由来する[2]。, 「働く」という意味の「εργον」に「αν」をつけた「αν εργον」(働かない)が語源とする説もある。また、ギリシャ語で「怠け者」という意味の「αργος」が語源とする説もある。[3][4], アルゴンは、地球大気中に窒素・酸素に次いで3番目に多く含まれている気体(水蒸気を除く) This gas is isolated through liquid air fractionation si… Uses of Argon. Our editors will review what you’ve submitted and determine whether to revise the article. Uses Of Argon. 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. It may be used for Narrow-angle glaucoma treatment: An argon gas laser is used for trabeculoplasty for narrow-angle glaucoma.It improves the drainage of the aqueous Argon is vital for welders and is something that they need regularly. Automotive & Transportation Equipment . Argon is a gaseous chemical element that makes up almost 1% of the Earth's atmosphere. Around here a bottle rental is approx $70/year so purchase is the way to go if you're going to be welding for any period of time. As befits an element that flies under the chemical and physical radar unless provoked, it is colorless, odorless and tasteless. Argon is a chemical element in the eighteen group of the periodic table. The gas cannot be liquefied by pressure above a temperature of −122.3 °C (−188.1 °F), and at this point a pressure of at least 48 atmospheres is required to make it liquefy. It is used to fill incandescent and fluorescent light bulbs to prevent oxygen from corroding the hot filament. Argon (Ar), chemical element, inert gas of Group 18 (noble gases) of the periodic table, terrestrially the most abundant and industrially the most frequently used of the noble gases. As the plasma is directed to the closest grounded source, APC has the ability to treat lesions lateral to the probe, or around a bend, that would not be suitable for laser therapy. It is classified as a noble gas.The argon atom has 18 electrons and 18 protons. Argon 18 is a high-end and high-performance road bike manufacturer located in Montreal, Canada. 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 is also used in argon lasers and argon-dye lasers. An argon laser has multiple uses in ophthalmology. argon synonyms, argon pronunciation, argon translation, English dictionary definition of argon. 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. ), comprising of less than 1% of the earth’s atmosphere. argon (Jawi spelling ارݢون‎, plural argon-argon, informal 1st possessive argonku, impolite 2nd possessive argonmu, 3rd possessive argonnya) argon (chemical element) Maltese Etymology (This etymology is missing or incomplete. The production of argon-40 from potassium-40 decay is utilized as a means of determining Earth’s age (potassium-argon dating). Outright bottle purchase $270 CAD full of Argon. Narrow-angle glaucoma treatment: An argon gas laser is used for trabeculoplasty for narrow-angle glaucoma.It improves the drainage of the aqueous humor (eye fluid). 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