explain why the capillary tube of a clinical thermometer has a constriction
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Answer:
Prevents the mercury thread from retreating into the bulb.
Explanation:
When the temperature of a patient is measured with a clinical thermometer, the mercury in the bulb expands and rises in the tube. The small constriction in the thermometer prevents the mercury thread from retreating into the bulb.
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Answer: Thermometers, usually made of glass, contain a narrow capillary tube and a liquid whose density changes predictably with temperature. When the liquid is heated its density decreases and it occupies more space. In the sealed thermometer this means that the liquid rises up the capillary tube.
Explanation:
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