Physics
NULL
Medium
Question
In a clinical thermometer the mercury in the capillary tube does not contract once removed from the patient because_______________?
A
Mercury takes a long time to contract
B
The amount of mercury use is very small
C
The capillary tube has a small constriction near the bulb
✓ Official correct answer
D
The capillary tube is very narrow
Community credibility
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A
Mercury takes a long time to contract
No member explanations yet for this option.
B
The amount of mercury use is very small
No member explanations yet for this option.
C
The capillary tube has a small constriction near the bulb
No member explanations yet for this option.
D
The capillary tube is very narrow
No member explanations yet for this option.
Explanation
A clinical thermometer has a narrow constriction in the capillary tube near the bulb; once the mercury expands past it, the constriction prevents it from flowing back, so the reading stays fixed until manually reset.
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