Question

Suggest why the vacuum flask is commonly called thermos flask

Answer 1

Vacuum flask is commonly called thermos flask because vacuum prevents conduction same with thermos flask. The tight stopper prevents air from entering or leaving the flask so there is a no chance of convention.

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Answer 2

Because a vacuum hinders conduction in the same way as a thermos flask does, vacuum flasks are also known as thermos jars. Air cannot enter or exit the flask because of the tight stopper, eliminating any possibility of the convention.

Explanation:

• By preventing heat from the environment from transferring to the liquid, the vacuum flask was developed to preserve liquefied gases. Silvering the glass or steel reduces radiation to a minimum, making the evacuated space between the walls—typically made of glass or steel—practically a nonconductor of heat.
• For many hours, Thermos flasks keep hot liquids hot and cold liquids cold. It consists of a double-walled glass vessel. A metal or plastic cover surrounds the glass jar to shield it from harm. The vacuum in the gap between the walls prevents heat from escaping through conduction and convection. The inner surface of the outer wall and its exterior surface are both silvered. Radiation heat loss is decreased by the reflective surfaces. The mouth of the vessel is sealed up with an insulating stopper. Over an insulating pad, the vessel is stored. Therefore, it is thermally insulated. As a result, heat cannot easily escape or enter, and as a result, hot liquids stay hot and cold liquids stay cold inside.

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