Question

What is the use of kink in a thermometer ?

Answer 1

Explanation:

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A 'kink' in the glass tube which breaks the mercury as it contracts, storing the highest temperature reading. The glass tube is shaped like a lens to magnify the thin mercury thread. Shaking the thermometer resets the mercury back into the bulb.

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Answer 2

Answer:

The kink breaks the mercury ensuring that the mercury isn't sucked back into the bulb allowing the temperature to be read. Before it can be used again the thermometer has to be shaken to force the mercury back down and remove the break.

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