Dewar
A Dewar flask is a vessel designed
to provide very good thermal
insulation.
For instance, when filled with a hot liquid, the vessel will not allow the heat to easily escape, and the liquid will stay hot
for far longer than in a typical container. The Dewar flask was named after its
inventor, the Scottish physicist Sir James Dewar (1842–1923).
Dewar flask
Source: wikipedia, NASA
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