Question

What is the use of kink in a clinical thermometer?​

• A. To increase expansion of mercury in the capillary tube​
  
• B. To decrease expansion of mercury in the capillary tube​
  
• C. To minimise use of mercury in the thermometer​
  
• D. To prevent falling of mercury in the bulb​
  

Answer 1

The correct option is D To prevent falling of mercury in the bulb​


Kink is present in the clinical thermometer to prevent the quick backflow of mercury into the thermometer bulb when the thermometer is removed from the mouth of the patient. The kink prevents the mercury level from falling quickly back to the bulb so that we can read the temperature of the patient carefully.