Problem 3: Flow manometer The figure below shows how one typically measures the pressure difference in a horizontal flow via a manometer. Suppose fluid is flowing from left to right. The manometer shown below is at hydrostatic equilibrium with fluids of densities pa and pa. What is an expression for the pressure difference between pts 1 and 2 in terms of the densities and the measured heights a and h? A flow section or flow device Fluid h PI B P2