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Question
You may have noticed that a few sharp jerks are given to a clinical thermometer before using it. Why is it done so?
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Solution
A clinical thermometer has a kink that prevents immediate backflow of the mercury from the tube to the bulb, thus allowing us to read the temperature conveniently. This is the reason why we give a jerk to the thermometer before taking a new reading. The jerk positions the mercury below the kink into the bulb.
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