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20.9 MB (850.5 KB compressed)
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18.8 x 27.7 cm ⏐ 7.4 x 10.9 in (300dpi)
CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY
Thermos flask. Thermos flasks keep hot drinks warm and cold drinks cool. They comprise an outer container and an inner container separated by a vacuum. The vacuum reduces heat transfer from the interior to the exterior of the flask. Modern types are usually made from stainless steel and plastics.
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