Question

There is a constriction near the bulb in a clinical thermometer why?

Answer 1

Answer:

The constriction in the thermometer is to prevent the mercury from dropping back to the bulb when the reading is being taken. It is easier for us to take reading. It prevents the thermometric substance (Mercury or Alcohol) from running back into the bulb.

Answer 2

Answer:

There is a construction to prevent the mercury from dropping back to the bulb. It makes the thermometer easier to take reading.

This thermometer (used fir water) is not used to check the body temperature because when it gets throughout the mercury level sudden decreases because of this the thermometer does not gives the correct temperature.

Clinical thermometer is used to check the body temperature because the mercury level does not sudden decreases into the bulb.

It makes the thermometer substance such as mercury or alcohol reaches back to the bulb.