A special insulated container with two walls separated by a vacuum, designed to keep liquids (especially liquefied gases) extremely cold or hot for long periods.
Named after Sir James Dewar, a Scottish chemist and physicist who invented this vacuum-insulated flask in 1892 to store liquid hydrogen. The design was so practical it became a generic term for similar containers.
James Dewar invented this bottle to keep liquid hydrogen cold, and it was so good at insulation that it became the standard for keeping everything from coffee to liquid nitrogen cold—the vacuum between walls is the same technology in your fancy coffee thermos!
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