An open-tube mercury manometer is used to measure the pre...
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. density of mercury = 13600kg/m3,g=9.8m/s2
108,986 Pa
165,238 Pa
122,364 Pa
134,645 Pa
Correct answer is D
density (ρ) = 13600 kgm−3; g =9.8ms−2
Patm =101,325 Pa; ρ=13600 kgm−3
Pabs=Patm+ρgh
⇒Pabs=101,325+13600 x 9.8 x 0.25
⇒Pabs=101,325+33320
⇒ Pabs=134,645Pa
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