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.
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.
It is quite hard to read a thermometer while it is in someones mouth. The kink in a clinical thermometer stops the fluid from dropping back down the tube after the thermometer is removed from the mouth, to give a more accurate reading.
In a laboratory it is normally easier to read the temperature of the scale while the bulb of the thermometer is in situ - therefore a kink is not needed.
A kink in a thermometer is an object through which mercury cannot fall when it is taken out of the mouth. It is only in clinical thermometers which are used by doctors and in labs.
It has klink because when mesuring the mercury dosent over flow or fall out
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A kink in the capillary tube of the thermometer is used as it do not allow the mercury to fall or rise on it's own while the thermometer is taken out after check-up. So this allows the person to check the temperature more accurately..
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kink
Mercury does not fall or rise in a clinical thermometer when taken out from the mouth because of the KINK present 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.
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.
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kink
Mercury does not fall or rise in a clinical thermometer when taken out from the mouth because of the KINK present in it.
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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.
The kink at one end of the thermometer will helps us to read the temperature frequently. P. bhanusree Jhonson grammar school, hyd
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.
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.
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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 characteristic belongs to a clinical thermometer
clinical thermometer: 1) it has kink in it 2)it ranges from 35C to 42C 3)it measures the temp. of human body 4)it is smaller in size laboratory thermometer 1) it doesn't have a kink in it 2) it ranges from -10 C to 110 C 3) it measures the temperature of many substances like water 4) it is larger in size from 2 students of class7A Apeejay, Saket,New Delhi,India iona k. borah and manal iqbal