1.10: Note that the lower- and upper-case deltas (d and D) are not the same as each other. Also, the addition of liquid to the right-hand leg will alter the height of the liquid in the left-hand leg.
1.16: To obtain an accurate result, you cannot assume that the air is incompressible.
1.23: You must derive the shapes of the interfaces, not assume them.
1.30: Note that the absolute pressure at the oil/methane interface is requested, not the gauge pressure there.
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