Answer :
Final answer:
The level of the liquid in the capillary tube ends at the same level as the bulb due to equal pressure.
Explanation:
In a thermometer, the mercury or alcohol inside the bulb expands when heated. As it expands, it rises up the capillary tube due to capillary action. When the temperature decreases, the liquid contracts and falls down the capillary tube. The level of the liquid in the capillary tube ends at the same level as the bulb because the pressure inside the bulb and the capillary tube is the same.
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