Question

10. A clinical thermometer has constriction above the bulb.​True or false

Answer 1

A clinical thermometer has a kink (or constriction) in its glass tube just above the bulb containing mercury . The kink is to prevent the back flow of mercury into the thermometer bulb when the thermometer bulb is removed from the mouth of a patient.

true

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Answer 2

little piece of design that makes the thermometer read the maximum patient temperature even after the thermometer has been removed from the body.

As soon as the thermometer is taken into the air, the mercury in the bulb starts cooling and contracting. Without the constriction, the mercury column in the scale would start moving back down, and the temperature indicated would be lower than the body temperature.

The constriction causes the mercury column to break under tension, leaving a vacuum between the bottom of the column and that in the bulb, and the top of the column stays still at the position reached in the body - a "peak hold" system.

You then have to reset the peak hold by shaking the thermometer to move the mercury column back into the bulb

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