Shows a closed tank holding air and oil to which is connected a u-tube mercury manometer and a pressure gage. determine the reading of the pressure gage, in lbf/in^2. (gage). the densities of the oil and mercury are 55 and 845, respectively, each in lb/ft^3. let g=32.2ft/s^2.

Explanation:

For pressure gage we can determine this by saying:

The closed tank with oil and air has a pressure of P₁ and the pressure of oil at a certain height in the U-tube on mercury is p₁gh₁. The pressure of mercury on the air in pressure gauge is p₂gh₂. The pressure of the gage is P₂.

We want to work out P₁-P₂: Heights aren't given so we can solve it in terms of height: assuming h₁=h₂=h

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