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	Dewar flask - Wikipedia, the free encyclopedia
		In form, a Dewar flask is a glass or metal bottle, with a double-layer construction; in fact, it can be considered to be two thin-walled bottles nested one inside the other, and sealed together at the neck.
		A very common use of the Dewar flask in laboratories is the storage of liquid nitrogen; in this case, the leakage of heat into the extremely cold interior of the bottle results in a slow "boiling-off" of the liquid (a pressure relief valve is provided to prevent pressure from building up).
		A "Thermos bottle" (trademarked), or vacuum flask (generic) used to keep coffee or other beverages hot, is usually based on the design of a Dewar flask; since glass dewar flasks are fragile and somewhat expensive to fabricate, other constructions based on plastic or insulated metal are also popular.
	en.wikipedia.org /wiki/Dewar_flask (358 words)

	BBC - History - Sir James Dewar (1842 - 1923) (Site not responding. Last check: 2007-09-19)
		The youngest of six boys, Dewar was born and raised in Scotland.
		Dewar's first paper was given by the Professor to the Royal Society of Edinburgh in 1867 and outlined a means to represent organic structures with copper strips and disks, using this method to suggest several different possible structures for benzene, including the correct one.
		In further work, Dewar looked at phosphorescence at low temperatures, and worked with Pierre Curie on radium decay to helium in 1904, the same year that he was knighted.
	www.bbc.co.uk /history/historic_figures/dewar_james.shtml (599 words)

	Dewar flask
		In form, a Dewar flask is a glass bottle, with a double-layer construction; in fact, it can be considered to be two thin-walled bottles nested one inside the other, and sealed together at the neck.
		A very common use of the Dewar flask in laboratories is the storage of liquid nitrogen; in this case, the leakage of heat into the extremely cold interior of the bottle results in a slow 'boiling-off' of the liquid (a valve is provided to prevent pressure from building up).
		A 'Thermos bottle' (trademarked), or vacuum flask (generic) used to keep coffee or other beverages hot, is sometimes based on a Dewar flask; since the glass flask is fragile and somewhat expensive to fabricate, other constructions based on plastic or insulated metal are also popular.
	www.ebroadcast.com.au /lookup/encyclopedia/de/Dewar_flask.html (312 words)

	Dewar flask. The Columbia Encyclopedia, Sixth Edition. 2001-05
		It consists of two flasks, one placed inside the other, with a vacuum between.
		For greater efficiency the flasks are silvered to reflect heat.
		The substance to be kept hot or cold, e.g., liquid air, is contained in the inner flask.
	www.bartleby.com /65/de/Dewarfla.html (121 words)

	Dewar flask (Site not responding. Last check: 2007-09-19)
		In form, a Dewar flask is a glass bottle, with a double-layer construction; in fact, it can be considered to be twothin-walled bottles nested one inside the other, and sealed together at the neck.
		A very common use of the Dewar flask in laboratories is the storage of liquid nitrogen ; in this case, the leakage of heat into the extremely cold interior of the bottle results in a slow'boiling-off' of the liquid (a valve is provided to prevent pressure from building up).
		A 'Thermos bottle' (trademarked), or vacuum flask (generic) used to keep coffee or other beverages hot,is sometimes based on a Dewar flask; since the glass flask is fragile and somewhat expensive to fabricate, other constructionsbased on plastic or insulated metal are also popular.
	www.therfcc.org /dewar-flask-24548.html (302 words)

	Vacuum separator for dewar flask cold exchange systems - Patent 4944155
		A Dewar flask cold exchange system 10 includes an exterior vessel 11 to which a pair of handles 12 are affixed at opposite sides of the vessel.
		The Dewar flask 10 includes a cold finger 30 which is suitably attached to the outer wall 14 of the inner vessel 13 in heat transfer relation.
		In prior art Dewar flask systems, the seal between the Dewar vacuum and the device chamber vacuum maintained by the vacuum separator is typically tested by first drawing a vacuum in the flask and then pumping helium gas into the device port.
	www.freepatentsonline.com /4944155.html (3011 words)

	Vacuum flask
		A vacuum flask or Thermos flask is a bottle that reduces heat transfer from the inside to the outside and conversely to a minimum, and therefore keeps warm drinks warm and refrigerated drinks cold.
		It was invented by Sir James Dewar, a scientist at Oxford University in 1892.
		Historically vacuum flasks have been made of glass although they are now also made in metal which makes them more durable and less prone to breakage.
	www.fastload.org /va/Vacuum_flask.html (171 words)

	Electric coffee maker - Patent 4205598
		The circulating heater in the outer jug-housing is preferably in the space of the bottom rounded portion of the Dewar flask or vessel.
		Since the Dewar flask is round for manufacturing reasons, it is practical to provide at the side of the outside shell in the region of the handle a vertical bulge containing a fresh water tube or conduit between the convection heater and the connection tube.
		Even in the case of a rather sharp cornered transition between side wall and bottom of the Dewar vessel, because of the required centering and holding means which are disposed in the bottom region, enough space is available at the bottom of the Dewar vessel for installing a convection heater according to the invention.
	www.freepatentsonline.com /4205598.html (2608 words)

	Today in Technology History - Sep 20
		Dewar (pronounced DYOO-er) was born in Scotland on September 20, 1842.
		Dewar wanted to study the properties of these liquefied gases, but it wasn't easy to keep them cold long enough to study them.
		Dewar himself had nothing to do with the Thermos company, since he never patented his invention.
	www.tecsoc.org /pubs/history/2002/sep20.htm (348 words)

	Dewar flask on Encyclopedia.com (Site not responding. Last check: 2007-09-19)
		DEWAR FLASK [Dewar flask] [for Sir James Dewar ], container after which the common thermos bottle is patterned.
		DEWAR'S LOST TREASURE: From his trademark s spectacles to his red rosette, Donald's cherished keepsakes.(News)
		The vacuum flask was invented by Scottish chemist James Dewar in about 1872.(Image Helicon) Helicon Publishing Ltd. 1999
	www.encyclopedia.com /html/D/Dewarfla.asp (185 words)

	Dewar, James (Site not responding. Last check: 2007-09-19)
		In the 1870s he invented the Dewar flask (or thermos flask), using it in his studies of low temperatures and gas liquefaction.
		Dutch physicist Heike Kamerlingh Onnes managed to liquefy helium using Dewar's techniques in 1908, and Dewar was then able to achieve temperatures within a degree of absolute zero (273°C/459°F) by boiling helium at low pressure.
		Dewar also carried out work in spectroscopy, particularly concerned with the absorption spectra of metals.
	www.cartage.org.lb /en/themes/Biographies/MainBiographies/D/Dewar/1.html (173 words)

	A QUICK GUIDE TO CRYOGENS
		The storage dewars have two valves, one at the top, which must be opened to insert the transfer tube, the other on a vent line used for pressurizing the dewar during a transfer.
		On the IR array instruments, both the fill and vent lines of the LHe fill fixture on the dewar are gently plugged with pipe cleaners; this results in a very small overpressure, which prevents the ambient atmosphere from being sucked in and frozen inside the lines.
		On initial fills, the height of the dewar to be filled must be adjusted so that the transfer tube will reach nearly to the bottom of its LHe flask when the other end is at the bottom of the storage dewar flask.
	www.noao.edu /kpno/manuals/irim/cryo.html (4249 words)

	Vacuum Flask
		A vacuum flask or Dewar flask has the remarkable capacity to hold extremely cold liquids like liquid nitrogen for a considerable length of time.
		Clearly, the flask is able to effectively block heat transfer from the outside either through the walls or through the open top.
		The blocking of heat transfer into the liquid nitrogen from the top of a vacuum flask involves the insulating properties of gases and the ideal gas law.
	hyperphysics.phy-astr.gsu.edu /hbase/thermo/vacfla.html (200 words)

	Dewar flask - Encyclopedia, History, Geography and Biography
		Dewar flask - Encyclopedia, History, Geography and Biography
		A Dewar flask is a glass vessel designed to provide very good thermal insulation.
		This encyclopedia, history, geography and biography article about Dewar flask contains research on
	www.arikah.com /encyclopedia/Dewar_flask (369 words)

	Reference.com/Encyclopedia/James Dewar
		Sir James Dewar (September 20, 1842 - March 27, 1923) was a Scottish chemist and physicist.
		He developed an insulating bottle, Dewar flask, still named after him, to study low temperature gas phenomena.
		He is credited as the inventor of the vacuum flask.
	www.reference.com /browse/wiki/James_Dewar (226 words)

	Read about Dewar flask at WorldVillage Encyclopedia. Research Dewar flask and learn about Dewar flask here! (Site not responding. Last check: 2007-09-19)
		A very common use of the Dewar flask in laboratories is the storage of liquid
		The excellent insulation of the Dewar flask results in a very slow "boil" and thus the nitrogen lasts a long time without the need for expensive
		vacuum flask (generic) used to keep coffee or other beverages hot, is usually based on the design of a Dewar flask; since glass dewar flasks are fragile and somewhat expensive to fabricate, other constructions based on
	encyclopedia.worldvillage.com /s/b/Dewar_flask (300 words)

	Flask-to-flask condensation (Site not responding. Last check: 2007-09-19)
		The flask on the left side, which will contain the solution to be concentrated, has to be stirred during the distillation.
		The flask on the right side has to be immersed in a Dewar flask which contains either a cooling bath (isopropanol/dry ice) or liquid nitrogen.
		The flask that is immersed into the Dewar should be at least one size bigger that the flask with the solution.
	www.chem.ucla.edu /~bacher/CHEM174/glassware/Flasktoflask.html (332 words)

	Ice Point Calibration
		In a Dewar flask, place distilled water, and shaved or crushed clear ice (<2mm pieces) made from distilled water.
		The tool used for stirring should not be removed from the Dewar flask during the test, to avoid introducing heat sources.
		Wipe down the Dewar flask and ice crusher with distilled water prior to performing this test.
	www.thermometricscorp.com /icepoincal.html (383 words)

	Dewar Flask (Site not responding. Last check: 2007-09-19)
		In form, a Dewar flask is a glass bottle, with a double-layer construction; in fact...
		Sir James Dewar - Sir James Dewar was the inventor of the Dewar flask - the first thermos and the co-inventor of cordite - a smokeless gunpowder.
		Dewar invented the Dewar flask in 1892 to...
	www.cup2kettle.com /dewar-flask.html (715 words)

	MDP2P by 2-Nitropropene Alkylation of 1,3-Benzodioxole - [www.rhodium.ws] (Site not responding. Last check: 2007-09-19)
		The flask was then secured within a dewar flask sitting on top of a magnetic stirplate.
		Dry ice was added to the dewar flask which was filled with acetone until a temperature of approx -78ºC was acquired.
		The dewar flask was removed and the stirring solution was allowed to warm up to room temperature, during which time the fl solution will change viscosity and colour.
	www.erowid.org /archive/rhodium/chemistry/mdp2p.nitroalkylation.html (321 words)

	Stainless Steel Cased Glass LN2 Dewars - Dewars (LN2)
		The fully silvered borosilicate glass inner flask is manufactured to a precise tolerance.
		The vac-seal dewars are suitable for storage of liquid gases and solid CO
		Dewar Flask Stainless Steel/Glass with lid and clips, 1 Ltr.
	www.sciencelab.com /page/S/PVAR/23600/65-238146 (247 words)

	Looking for a used Cryogenic Dewar Flask? - Find it at Used-Line.com
		5 Nalgene Dewars (Cryogenics) These dewars are of different sizes.
		Planer 25 liter Dewar with Planer control system.
		Oxford 200 MHz (89 mm) widebore magnet with family style dewar.
	www.used-line.com /b2054p1pr0-used-dewar-flasks.htm (139 words)

	James Dewar - TheBestLinks.com - Benzene, Chemist, Dewar flask, Frederick Augustus Abel, ... (Site not responding. Last check: 2007-09-19)
		James Dewar - TheBestLinks.com - Benzene, Chemist, Dewar flask, Frederick Augustus Abel,...
		James Dewar, Benzene, Chemist, Dewar flask, Frederick Augustus Abel, Hydrogen...
		He was born in Kincardine-on-Forth and studied at the University of Edinburgh, where he graduated.
	www.thebestlinks.com /James_Dewar.html (231 words)

	AllRefer.com - Dewar flask (Physics) - Encyclopedia
		You are here : AllRefer.com > Reference > Encyclopedia > Physics > Dewar flask
		Dewar flask [for Sir James Dewar], container after which the common thermos bottle is patterned.
		More articles from AllRefer Reference on Dewar flask
	reference.allrefer.com /encyclopedia/D/Dewarfla.html (170 words)

	Compost Quality Analysis - Woods End Research Laboratory
		The super-insulated 100mm Dewar flask measures "residual" heating in compost in range of 0 to 70C, requiring up to 7 days to complete one test.
		The difference between the highest temperature attained in the flask and ambient is employed as an index.
		The test was first applied in 1988 in Germany to determine when compost is "ripe" ("Reifegrad") and is a required test for all composts in Germany.
	www.woodsend.org /aaa/testproducts.html (345 words)

	Dewar \|Lab Grade Dewar Vacuum Flask \|Cylindrical Wide Mouth or Narrow Neck \|
		Note that protected vacuum tip-off tubulations are offset to the side to minimize space between the Dewar bottoms and magnetic stirrers.
		These Dewars exemplify the emphasis placed on both efficiency and safety by Pope Scientific.
		Lab Grade Dewars with a narrow mouth are ideal for temporary storage or for room-to-room transfer
	www.popedewars.com /labgrade.html (297 words)

	scottish heritage - genealogy scotland - clans - scottish associations - historical attractions (Site not responding. Last check: 2007-09-19)
		In 1872 he invented the vacuum flask, still known to some as the Dewar flask.
		Dewar died at the Royal Institution on Albemarle Street, London, on 27 March 1923.
		Armstrong, wrote that the last time he saw Dewar, that same month, he was sitting in silent vigil at his instruments under the heavens.
	www.scotlandonline.com /heritage/heritage_gscots_detail.cfm?id=169 (335 words)

	U-B-Kool, What is Radiant Barrier? (Site not responding. Last check: 2007-09-19)
		It was invented by Scottish chemist and physicist, James Dewar (thus its name) around the turn of this century.
		Well, Dewar's theory was based on the fact that almost every single material known to man has an R-value, and the "R" only stands for 'resistance'.
		But gold, silver, and aluminum are also conductors, so in order for the Dewar Flask to work, he used glass as the thermal barrier.
	www.u-b-kool.com /WhatIsRB.htm (473 words)

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