why does a clinical thermometer have a kink?

In a clinical thermometer kink plays an important role. kink prevents the mercury present in the capillary to fall back in the bulb. So it separates the mercury at high temperature and cool mercury and allows the user to note the reading when the thermometer is taken out. 

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clinical thermometer has a kink because the mercury contracts very fastly and we could not see our tempreture the kink stops the mercury to cool rapidly.

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the kink stops the mercury so that we could see the temparature

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THE CLINICAL THERMOMETER HAS A KINK FOR PREVENTING THE MERCURY LEVEL FROM FALLING ON ITS OWN

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A CLINICAL THERMOMETER HAS A KLINK WHICH PREVENTS THE MERCURY FROM FALLING ON ITS OWN.

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