What is the use of kink near the bulb in clinical thermometer | Filo

Class 7

Science

Physics

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

1. It prevents the level of the mercury from falling when taken out of the mouth
2. It allows the level of the mercury to fall when taken out of the mouth
3. It allows the level of the mercury to rise when taken out of the mouth
4. It prevents the level of the mercury from rising when taken out of the mouth
Solution:
Since, in clinical thermometer, mercury is used and level of mercury rises very rapidly with small variation in temperature that's why thermometers provided with kink near the bulb so it prevents the level of mercury from falling when taken out of mouth.
Hence, the answers are it prevent the level of the mercury from falling when taken out of the mouth, it allows the level of the mercury to fall when taken out of the mouth.
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