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Question: consider a utube whose arms are open to the atmosphere...

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Consider a U-tube whose arms are open to the atmosphere. Now equal volumes of water (density 62.4lbm/ft^3) and light oil (ρ=49.3lbm/ft^3) are poured from different arms. A person blows from the oil side of the U-tube until the contact surface of the two fluids moves exactly to the bottom of the U-tube, and thus the liquid levels in the two arms become the same. If the fluid height in each arm is 30in, determine the gage pressure, in psi units, that the person exerts on the oil by blowing.

Can you determine the person's absolute blowing pressure if the atmospheric pressure is 1Atm?

If the person stops blowing from the oil side and now the oil side is in contact with atmospheric air, how high (in in units) the oil level ought to rise? You may assume that the air density is 0.077lbm/ft^3.

Assume now, that the person now starts blowing from the air side of the U-tube until the contact surface of the two fluids moves exactly to the bottom of the U-tube, and thus the liquid levels in the two arms become the same. Can you estimate the gage pressure the person exerts on the water in psi units?

What is the gage pressure the person exerts on the water in Pa units?

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