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A vacuum flask; a vessel which keeps its contents hotter or cooler than their environment without the need to modify the pressure, by interposing an evacuated region to provide thermal insulation between the contents and the environment.
2009 February 17, Guy Gugliotta, “Perseverance Is Paying Off for a Test of Relativity in Space”, in New York Times:
A large thermos-like container called a dewar contained 645 gallons of liquid helium to be cooled to within two degrees of absolute zero.
