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22.8 MB (674.6 KB compressed)
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19.6 x 29.2 cm ⏐ 7.7 x 11.5 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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