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You're referring to alcohol or Mercury thermometers used to take person's temperature?
That constriction slows the flow of the alcohol back into the bulb after the thermometer is removed from your mouth (or elsewhere) so the temperature can be read more accurately. Otherwise the indicated temp would begin to decrease as soon as the bulb is moved to a cooler environment.
That why you see the nurse shaking the thermometer down before use, to get all the alcohol back into the bulb so it can re-expand properly before the next use.
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∙ 16y ago
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Why is there no kink in a laboratory thermometer?
hfth
Why is kink in clinical thermometer?
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Why lab thermometer do not have kink?
the temparature of the liquid must be read while the thermometer is in the liquid.since the level of mercury drops as soon as the thermometer is taken out of the liquid ,therefore no need of the kink in thermometer.
What is the mercury called on a clinical thermometer?
kink
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.
How does the kink in a mercury or alcohol work in a clinical thermometer?
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.
Does digital thermometer has kink?
No need for such kink since the maximum temperature sensed could be recorded and can be seen at any time.
What is the role of the kink in clinical thermometer?
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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 doesn't the mercury on a medical thermometer go down when it's removed from the body?
There is a kink put in the tube which carries the mercury up the thermometer, that is why it needs to be shaken to send it back to the bulb
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.
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.
