Sir James Dewar

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Noun1.Sir James Dewar - Scottish chemist and physicist noted for his work in cryogenics and his invention of the Dewar flask (1842-1923)
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1923: Chemist and physicist Sir James Dewar, who invented the vacuum flask, died in London.
1842: Sir James Dewar, Scottish physician and chemist, and inventor of the vacuum flask, was born at Kincardine-on-Forth.
What did Sir James Dewar invent to help his experiments on cooling gases to such low temperatures that they would liquefy?