Parts of a vacuum flask and their functions

  Inside a vacuum flask :

Screw-on stopper. Outer plastic or stainless steel case. Outer layer of glass coated with reflective material (or stainless steel in unbreakable flasks). .Inner layer of glass (or stainless steel in unbreakable flasks). One or more supports keep inner vacuum container in place.

The vacuum flask was devised to preserve liquefied gases by preventing the transfer of heat from the surroundings to the liquid. The evacuated space between the walls (which are ordinarily glass or steel) is practically a nonconductor of heat; radiation is reduced to a minimum by silvering the glass or steel.

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Explanation:

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