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The kink stops the mercury from falling, giving the user/reader of the thermometer time to read the highest temperature recorded. Shaking the thermometer lets the mercury fall again.

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A Mercury barometer works by expanding and therefore raising the mercury of the barometer, then reading the level up to which the mercury has gone.


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Related Questions

What is the mercury called on a clinical thermometer?

The liquid in a clinical thermometer is called mercury. It is used to measure body temperature by expanding and rising within the thermometer.


Why does a clinical thermometer have a kink?

The kink in a clinical thermometer prevents the mercury from falling back down when the thermometer is removed from the body. It ensures that the highest temperature reached is recorded until it is reset.


Why is kink provided in a clinical thermometer?

The kink in a clinical thermometer prevents the column of mercury from falling back down when the thermometer is removed from the patient's body, allowing for an accurate temperature reading to be taken and read.


Why does the mercury not fall or rise in a clinical thermometer when taken out of the mouth?

Mercury does not fall or rise in a clinical thermometer when taken out from the mouth because of the KINK present in it.


Why is kink in clinical thermometer?

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What is the role of the kink in clinical thermometer?

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Why does a clinical thermometer has a kink in its tube?

So the working fluid doesn't flow back into the bulb when the it is removed from the heat source. This makes a clinical thermometer "sticky"; it retains the reading of the highest temperature experienced until it is "reset" by shaking.


Why there is kink in clinical thermometer?

In a normal clinical thermometer, the mercury moves up and down the capillary tube as the temperature changes and thus if you removed it from contact with the patient the reading would steadily fall as it cooed. As you need a clinical thermometer to give you a reading of the patients temperature even after it has been removed from the patient, you need to stop the mercury shrinking back into the reservoir. The 'kink' breaks the connection between the mercury in the capillary tube and the reservoir so the reading given is accurate. On the other hand before it can be used again the mercury in the capillary tube has to be vigorously shaken back into the reservoir.On a point of interest, clinical thermometers are getting very rare because they have been phased out due to concerns regarding mercury poisoning should they break in use.


What is the purpose of the 'kink' in clinical thermometer?

In a normal Mercury thermometer, the mercury moves up and down the capillary as the temperature changes and thus if you removed it form contact with the patient the reading would steadily fall as it cooed. As you need a medical thermometer to give you a reading of the patients temperature even after it has been removed form the patient, you need to stop the mercury shrinking back into the reservoir. The 'kink' does this, it breaks the connection between the mercury in the capillary and the reservoir so the reading given is accurate. On the other hand before it can be used again the mercury in the capillary has to be vigorously shaken back into the reservoir. On a point of interest, clinical mercury thermometers (with the 'kink') are getting very rare because they have been phased out due to concerns regarding mercury poisoning should hey break in use.


Why does the mercury fall or rise in a clinical thermometer when it is taken out of the mouth?

A clinical thermometer measures the max temp of the human body due to the expansion of the mercury in the bulb, which flows past a kink in the column and rises in the graduated stem, to read the highest body-temp. Once it is removed from the body, the mercury stays at that level, and does not fall because it cannot flow back into the bulb -- the kink prevents the back flow. It has to be shaken vigorously, as you know, for us to get the mercury back; then it is ready to take the temp again.. Also, the temp cannot rise further on its own from the max reading because the mercury does not expand the moment the thermometer is taken out of the body. Incidentally, temp can be measured under the armpits and in the rectum also.


What are some advantages of a clinical thermometer?

The kink at one end of the thermometer will helps us to read the temperature frequently. P. bhanusree Jhonson grammar school, hyd


Why does a clinical thermometer has a kink in it?

So the working fluid doesn't flow back into the bulb when the it is removed from the heat source. This makes a clinical thermometer "sticky"; it retains the reading of the highest temperature experienced until it is "reset" by shaking.