The unit shown below is used to measure the depth of fluid in a tank.The density of the fluid is 72 lbm/ft³.Air is slowly bubbled into the tank through the dip tube. The dip tube reaches 1 m from the bottom of the tank. The bubbling is so slow that the air in the tube can be assumed to be stagnant (not moving). If the pressure gauge measures 20 psig, what is the height of the fluid in the tank in ft?

a) Draw manometer representation of this situation.

b) List assumptions

c) Write the manometer equation for this situation

d) Solve for the height of fluid in the tank

e) If the tank were not vented to the atmosphere, but instead had nitrogen gas above the liquid surface at 5 psig, solve for the height of fluid in the tank for this scenario.