What keeps the mercury level from falling back into the bulb in a clinical thermometer?

Heat

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Kink

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Capillary

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Stem

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Solution

The correct option is B Kink

A 'kink' in the glass tube breaks the mercury column, storing the highest temperature reading. This ensures that the reading does not go down after removed from the contact with the body.
Shaking the thermometer again connects the mercury column. This resets the mercury back into the bulb making it ready for the next use.

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