Question

what is the use of kink in clinical thermometer

Answer 1

Kink  in  the Mercury thermometer helps to prevents the falling of mercury present in capillary  tube into bulb. It ensures that the user takes the correct reading of temperature.

That's  the reason a person before taking  a new reading must give a sudden shake to the clinical thermometer so that the mercury level comes to normal .

Hence Kink in mercury thermometer plays a important  role without which appropriate reading of temperature is not possible.

Hope it helps...

Answer 2

All clinical thermometers have a kink that prevents the mercury from flowing back into the bulb when the thermometer is taken out of the person's mouth so that his/her temperature can be noted down.