What is thermom flask?
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Posted by Yash Garg 6 years, 2 months ago
- 2 answers
Gaurav Seth 6 years, 2 months ago
A thermos flask or a vacuum flask is used to keep a hot liquid hot and a cold liquid cold for a long time, by preventing the loss or gain of heat energy due to conduction, convection and radiation. It was invented by Sir James Dewar in 1892.
The thermos flask consists of a double-walled glass vessel resting on a cork inside a metal or plastic case. The outer surface of its inner wall and the inner surface of its outer wall are silvered. The space between the two walls is almost vacuum and the walls are sealed at the top. The flask is placed on a cork in a metal case and is secured at the neck with a ring of rubber.
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Shalini Prabhu 6 years, 2 months ago
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