There is narrow construction near the bulb in a clinical thermometer,why?
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A clinical thermometer has a constriction near the bulb in it. Due to this, mercury thread does not fall on removing the bulb from the mouth of the patient. ... This helps the mercury in the bulb to acquire the patient's temperature more quickly and precisely.
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It prevents the thermometric substance (Mercury or Alcohol) from running back into the bulb. The constriction in the thermometer is to prevent the mercury from dropping back to the bulb when the reading is being taken
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