Question

A gas bulb, connected to an open-end manometer, shows that the mercury level in the arm of the manometer connected to the gas is lower than the level in the other end by h = 76 mm. Atmospheric pressure is 760 mm. What is the pressure of the gas?

Answer 1

$$P_G=P_a+\rho gh$$

$$P_G=760+76=836\ mm\ Hg$$