alleryStart learning →In an open-end manometer, the difference between the two liquid levels measures which quantity?
AThe pressure of the trapped gas alone
BThe pressure of the atmosphere alone
CThe gap between gas and air pressure
DThe density of the liquid in the tube
Answer & Solution
Correct answer: C. The gap between gas and air pressure
1. An open-end manometer has one arm joined to the gas and one arm open to the air.
2. The mercury settles where the two pressures balance, so the height gap records the difference between them.
3. To get the gas pressure itself you still have to add or subtract atmospheric pressure.
4. A closed-end manometer has a vacuum above the mercury, and there the height gap gives the gas pressure directly.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.1 Gas Pressure_
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