Why there is kink in clinical thermometer?

Answer 1

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.

Answer 2

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.

Answer 3

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.

Answer 4

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.

Answer 5

It has klink because when mesuring the mercury dosent over flow or fall out

Answer 6

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Answer 7

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..