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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Gas syringe ： ウィキペディア英語版 Gas syringe A gas syringe is a piece of laboratory glassware used to insert or withdraw a volume of a gas from a closed system, or to measure the volume of gas evolved from a chemical reaction.〔Mattson, Bruce. Microscale Gas Chemistry: Determination of the Molar Mass of Gas. Microscale Gas Chemistry. Bruce Mattson, 15 Mar. 2010. Web. 17 Nov. 2011. .〕 A gas syringe can also be used to measure and dispense liquids, especially where these liquids need to be kept free from air.〔UCLA, comp. Procedures for Safe Use of Pyrophoric Liquid Reagents. Procedures for Safe Use of Pyrophoric Liquid Reagents. UCLA Chemistry & Biochemistry, Sept. 2009. Web. 17 Nov. 2011. .〕 A gas syringe has an inner syringe chamber which has a ground glass surface. The syringe barrel also has a ground glass surface. The ground surface of the barrel moves freely within the ground glass surface of the syringe chamber with very little friction. The close mating of these ground glass surfaces also gives a reasonably gas-tight seal.〔VICI. "Pressure Lok® Glass Syringe Features." Valco Instruments Company Incorporated. Valco Instruments Company Incorporated, Jan. 2011. Web. 17 Nov. 2011. .〕 Like a ground glass stopcock, the two parts of a gas syringe should preferably not be interchanged with another gas syringe of the same volume, unless told otherwise by the distributor.〔 Gas syringes come in various sizes from 500 ml to 0.25 ml and tend to be accurate to between 0.01 and 1 ml, depending on the size of the syringe.〔Valco. "Gas/Liquid Syringes." Valco Instruments Company Incorporated. Valco Instruments Corporation In., Jan. 2011. Web. 17 Nov. 2011. .〕 ==Gas Syringe use== A gas syringe can be used to measure gaseous products from a reaction.〔 When using a gas syringe to measure gases it is important to keep the syringe free from liquids. As gases can dissolve in liquids, especially under any resulting pressure, this may result in inaccurate measurements (Henry's law).〔Plambeck, James A. "Introductory University Chemistry I. Henry's Law and the Solubility of Gases." D. W. Brooks Site. James A. Plambeck, 03 Nov. 1995. Web. 17 Nov. 2011. .〕 The amount of gas in moles formed in a reaction can be measured by measuring the volume of gas evolved at standard (or known) pressure conditions (gas law, PV=nRT).〔 Accordingly, it is important that the syringe barrel should move freely within the syringe chamber, if one assumes that the measured gas is at standard temperature and pressure. Any friction would result in a pressure build-up in the syringe and would lead to an inaccurate measurement, that is, a lower amount of gas would be determined, than really obtained.〔Schmid, H. P. "Pressure and Gas Laws." Indiana University. Indiana University, 18 Sept. 1997. Web. 17 Nov. 2011. .〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gas syringe」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.