Dewar vessel

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Named after scottish chemist / physicist Sir James Dewar, a Dewar Vessel is a double-walled glass vessel for holding liquid air, etc., having the space between the walls exhausted (made into a vacuum) so as to prevent conduction of heat, and sometimes having the glass silvered to prevent absorption of radiant heat. Depending on its shape, it may also be called a Dewar Bulb, or Dewar Tube.

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