Book 22, Question 68
How Does a Thermos Keep Soup Warm?
A thermos keeps soup hot for hours. It can also keep a cold drink cold. The thermos was invented in the 1890s by a scientist named James Dewar.
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Book 22, Question 68
A thermos keeps soup hot for hours. It can also keep a cold drink cold. The thermos was invented in the 1890s by a scientist named James Dewar.