An open-tube mercury manometer is used to measure the pressure in a gas tank. When...
PHYSICS
JAMB 2023
An open-tube mercury manometer is used to measure the pressure in a gas tank. When the atmospheric pressure is 101,325 Pa, what is the absolute pressure in Pa in the tank if the height of the mercury in the open tube is 25 cm higher
- A. 108,986 Pa
- B. 165,238 Pa
- C. 122,364 Pa
- D. 134,645 Pa
Correct Answer: D. 134,645 Pa
Explanation
density (ρ) = 13600 \(kgm^-3\); g =\(9.8 ms-2\)
\(P_atm\) =101,325 Pa; ρ=13600 (kgm^-3\)
Pabs=\(P_atm\)+ρgh
⇒Pabs=101,325+13600 x 9.8 x 0.25
⇒Pabs=101,325+33320
⇒ Pabs=134,645Pa
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