What did Dewar's vacuum flask help preserve?
Heat
Cold temperatures
Light
Sound
Answer
Dewar's vacuum flask, also known as a thermos, preserves cold temperatures by minimizing heat transfer. It consists of two glass flasks, one inside the other, with a vacuum between them. The vacuum acts as an insulator, preventing heat from entering or leaving the flask. The silvered inner surface of the flask reflects heat radiation, further reducing heat transfer.
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