Question 6 A cylindrical tank is vented to the atmosphere that serves as a reservoir for octane before it is piped to another location is 140ft in diameter. Determine the pressure difference between the top and bottom of the walls due to the octane when the tank is filled to a depth of 30ft (9.14m). Why is the vent necessary? NB: Atmospheric conditions are such that the pressure is 1atm and temperature 25C. SG of octane is 0.701