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A self-pressurising dewar (silver) being filled with liquid nitrogen from a larger storage tank (white). A cryogenic storage dewar (or simply dewar) is a specialised type of vacuum flask used for storing cryogens (such as liquid nitrogen or liquid helium), whose boiling points are much lower than room temperature.
A vacuum flask (also known as a Dewar flask, Dewar bottle or thermos) is an insulating storage vessel that slows the speed at which its contents change in temperature. It greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings by trying to be as adiabatic as possible.
Sir James Dewar FRS FRSE (/ dj uː ər / DEW-ər; [1] 20 September 1842 – 27 March 1923) was a Scottish chemist and physicist.He is best known for his invention of the vacuum flask, which he used in conjunction with research into the liquefaction of gases.
Dewar may refer to: Clan Dewar; Dewar (caste), a fishing caste from India; Vacuum flask (also known as a Dewar flask), a vacuum-insulated container used to maintain internal temperature for extended periods, named for British chemist James Dewar. Cryogenic storage dewar, a specialized vacuum flask for extremely cold fluids
A refrigerated transport Dewar is a refrigerated transport vessel with an insulated Dewar flask design to carry cryogenic liquid. To prevent pressure build-up they are equipped with safety relief valves and/or rupture discs .
Volumetric flask is used for preparing liquids with volumes of high precision. It is a flask with an approximately pear-shaped body and a long neck with a circumferential fill line. Dewar flask is a double-walled flask having a near-vacuum between the two walls. These come in a variety of shapes and sizes; some are large and tube-like, others ...
Cold trap immersed in cold medium in Dewar flask. Some workers prefer the opposite arrangement, where vapors flow down the wall of the trap, and are sucked up the inner tube; this reduces blockage.
Liquid nitrogen A demonstration of liquid nitrogen at the Freeside maker space in Atlanta, Georgia, during the Online News Association conference in 2013 Students preparing homemade ice cream with a dewar of liquid nitrogen. Liquid nitrogen (LN 2) is nitrogen in a liquid state at low temperature.
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