A small amount of air is introduced into the vacuum above the mercury in a...
PHYSICS
WAEC 2019
A small amount of air is introduced into the vacuum above the mercury in a mercury barometer tube. The mercury level goes down because the air molecules
- A. heat the mercury and make it expand
- B. increase the pressure above the mercury.
- C. cool the mercury and make it contract.
- D. decrease the pressure above the mercury
Correct Answer: B. increase the pressure above the mercury.
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