Dewar flask
Dewar flask [for Sir James Dewar], container after which the common thermos bottle is patterned. It consists of two flasks, one placed inside the other, with a vacuum between. The vacuum prevents the conduction of heat from one flask to the other. 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. See low-temperature physics.
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vacuum flask
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"vacuum flask." World Encyclopedia. . Encyclopedia.com. 21 Apr. 2018 <http://www.encyclopedia.com>.
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