1. The problem statement, all variables and given/known data This is from the notes given to my professor and I think that it may be incorrect: Essentially we have a mercury manometer that measures the pressure difference at points 1 and 2. The fluid flowing through the pipe is water. The goal is to find the height h. Now in these notes, my professor seems to be assuming that the pressure does not depend on the height in the water. This is because on the last line he wrote rho_Hg * g * h = P_1. However I think the distance used should be from the center line since the pressure changes? Also the pressure he solved for, P_1 = 11.3kPa (which I think is wrong), is the pressure at the streamline? This is wrong because we want to use the pressure RIGHT above the mercury. EDIT: I redid the question and found P1 = 69420Pa. Then I found a relationship between P1, P2 and h: P2 = P1 + rho_w * g * h - rho_Hg * g * h 0 = 69420 + 9.81 * h * (1000 - 13600) Solving for h I get 56cm.