Q: In a barometer, air is trapped in the space labelled 'A above the mercury level in the tube of the barometer, which measures 730 mmHg. If the atmospheric pressure is 750 mmHg, then the pressure of the trapped air is:
A.
730 mmHg
B.
750 mmHg
C.
20 mmHg
D.
745 mmHg
Correct Answer:
Option C -
Explanations:
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