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What did Sir James Dewar invent?

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Quick Answer

Scottish physicist and chemist Sir James Dewar invented the Dewar flask, better known as the thermos, in 1892. The thermos is a container that minimizes the change in temperature within the flask, thus allowing cold substances inside to remain cold and hot substances to stay hot.

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Full Answer

Dewar's invention was not intended for commercial use, but to help in his scientific work with liquid gases. The container was made with one flask inside another with a vacuum separating the two to minimize heat transfer. Several years later, two Germans used Dewar's prototype to make a commercial thermos, which they named from the Greek word "therme," which means "hot."

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