Question

How does the constrictions near the bulb in a clinical thermometer helps in measuring body temperature accurately?
Class 7​

Answer 1

Answer:

The constriction in the thermometer is to prevent the mercury from dropping back to the bulb when the reading is being taken. It is easier for us to take reading. It prevents the thermometric substance (Mercury or Alcohol) from running back into the bulb

Explanation:

It has a bulb of very thin glass attached to a capillary of the very fine bore. The bulb is long and thin instead of spherical. This helps the mercury in the bulb to acquire the patient's temperature more quickly and precisely. In Fahrenheit, the thermometer has the markings from 940 f to 1080 F.

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Answer 2

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.