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What is the use of kink near the bulb in clinical thermometer?

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Correct option is A)  It prevents the level of the mercury from falling when taken out of the mouth
Because mercury is used in clinical thermometers, and the level of mercury rises rapidly with small changes in temperature, thermometers are designed with a kink near the bulb to prevent the level of mercury from falling and ensure that the correct reading is obtained even after the thermometer is taken out of the mouth.
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