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A double-walled flask of metal or silvered glass with a vacuum between the walls, used to hold liquids at well below ambient temperature.
‘But in 1999 the project experienced major development problems when the large thermos bottle, called a dewar, which holds the supercold helium surrounding the instruments, did not cool down as quickly as expected.’
‘However, only the sample dewar was filled with liquid nitrogen.’
‘The freezing device was composed of the rotating copper or silver disks and the liquid nitrogen dewar.’
‘Liquid helium will boil off constantly through a special porous plug in the dewar to maintain the science probe at its required temperature for up to 18 months.’
‘The detector would be placed in a dewar, in effect a huge Thermos bottle.’
Origin
Late 19th century: named after Sir James Dewar (see Dewar, Sir James).