10.What is the purpose of having a constriction in clinical thermometer ,the
same is not seen in a ordinary thermometer
,why?
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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.
The fluid in the thermometer expands and contracts in response to ambient temperature. In medical applications it is usually inconvenient or impractical to read the thermometer in place. However, it will quickly revert to room temperature upon extraction. The constriction inhibits the fluid flow, giving the doctor time to get an accurate measurement.
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