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## Homework Statement

The gauge pressure at the inlet of a horizontal venturi meter is 40kPa. The vacuum at the throat is 38 mm mercury. If a differential U-tube manometer containing mercury is the U-tube and the oil in the connecting tubes is connected to the venturi, what will the difference in the mercury levels be? the fluid in the venturi meter is oil with a relative density of 0.8. Answer [0,359m]

## The Attempt at a Solution

**I have no idea how to start with this problem, i am assuming to use the following formulas but i dont understand them,**

**P1 - P1 / (p_oil)(g) = (S_m - 1) h_m**

**but i dont know how to get the answer, please assist me with this, i am going to youtube now to look for some tutorials on the u-tube manometer, you can also refer me to a great tutorial :-)**