The water manometer above is measuring the pressure of gas supply. if the specific gravity of mercury is 13.6 and the atmospheric pressure is 70cm of mercury what is the total pressure of the gas supply in cm of water
-
A.
67cm -
B.
73cm -
C.
949cm -
D.
952cm -
E.
955cm
Correct Answer: Option B
Explanation
Gas Pressure = Pressure exerted by the gas on the mercury in the manometer + Atm pressure of mercury
= 70cm + 3cm
= 73cm