Dewar flask
A glass vessel used for keeping liquids at
temperatures differing from that of
the surrounding air. This is done by reducing to a minimum the transfer
of heat between the liquid and the air. A Dewar
flask consists of a double-walled flask, with the space between the two
walls exhausted to a very high vacuum, to
minimize transfer of heat by convection
and conduction. The inner surfaces
of the walls are silvered to reduce transfer of heat by radiation;
areas of contact between the two walls are kept at a minimum to keep down
conduction of heat.
Related entry
• thermal radiation
Related category
• HEAT
AND THERMODYNAMICS
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