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What nationality was James Dewar?

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Answer

British scientist James Dewar was a renowned chemist and physicist. He is best known for his invention of the vacuum flask, also known as the Dewar flask, which is widely used for storing and transporting liquids at extreme temperatures. Dewar's contributions to science extended beyond the vacuum flask, as he also made significant advancements in the fields of low-temperature physics, spectroscopy, and electrochemistry.