Metal Dewar vacuum flask, early 20th century.
4 0 c m
 
35cm
actual image size: 27cm x 32cm

Metal Dewar vacuum flask, early 20th century.

© Science Museum / Science & Society Picture Library

Description

Reproduction. The vacuum flask was invented by the Scottish physicist James Dewar (1842-1923). This is a reproduction of one of Dewar's experimental flasks that has been cros-sectioned to reveal the inside. The flask contains a partial vacuum between its walls that greatly reduces conduction. A perfect vacuum contains no matter and therefore does not conduct heat. The flask is closed to maintain the vacuum and prevent convection, the transfer of heat by air circulation.
 

Image Ref.

10325919
 

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