Why the mercury levels come down in thermometer once it is removed from the body of the patient?
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Answer:
As the temperature rises, the mercury is pushed up through the constriction by the force of expansion. When the temperature falls, the column of mercury breaks at the constriction and cannot return to the bulb, thus remaining stationary in the tube.
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Answer: When the thermometer begins to cool, the contraction of the mercury breaks the thin thread of metal in the constriction. Surface tension prevents the metal from flowing back together and rejoining the reservoir, so the column that indicates the temperature remains in place. (Mechanical force, such as shaking, is needed to push the mercury down through the constriction for the next use of the thermometer.)
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