You may have noticed that a few sharp jerks are given to clinical thermometer before using it. Why is it done so?

AcademicPhysicsNCERTClass 7

A clinical thermometer is given sharp jerks to position the mercury into the bulb below a kink that a clinical thermometer has. This kink prevents the immediate backflow of mercury from the tube to the bulb. This is why a clinical thermometer is given a sharp jerk before taking a new reading.

Updated on 10-Oct-2022 13:29:46