Dewar flask

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Dew·ar flask

(do͞o′ər, dyo͞o′-)

An insulated container used especially to store liquefied gases, having a double wall with a vacuum between the walls and silvered surfaces facing the vacuum.

[After Sir James Dewar (1842-1923), British chemist and physicist who invented it.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Dewar flask

(ˈdjuːə)

(Chemistry) a type of vacuum flask, esp one used in scientific experiments to keep liquid air, helium, etc; Thermos

[C20: named after Sir James Dewar]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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Noun

Dewar flask - vacuum flask that holds liquid air or helium for scientific experiments

Dewar

vacuum bottle, vacuum flask - flask with double walls separated by vacuum; used to maintain substances at high or low temperatures

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This naturally carried on to some of the famous inventors that we have had in history, like Alexander Graham Bell, who invented the telephone, and Sir James Dewar, the inventor of the Dewar flask.

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A Dewar flask consists of a double wall, with the space between the two walls exhausted to a very high vacuum, to minimize transfer of heat by convection and conduction.

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So before each observing run Larson and I stopped by a cryogenic supply facility to fill our Dewar flask with this supercold -196[degrees]C (-321[degrees]F) liquefied gas.