# Open7 psiAirT2 ftWater2 ft

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The closed tank below is filled with water and is 5 ft long. The pressure gage on the tank reads 7 psi. Determine: (a) the height, h, in the open water column; (b) the gage pressure acting on the bottom tank surface AB, and; (c) the absolute pressure of the air in the top of the tank if the local atmospheric pressure is 14.7 psia. [Answer in units of ft. and psi]

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Step 1

Given: height of tank=5ft

Pressure Pair =7psi

Local atmospheric pressure  Po= 14.7 psi

Step 2

a)   Pressure at atmospheric level, Patm=0 as it is open to atmosphere

• To convert psi to lb/ft2 multiply the value 144
• Specific weight of water = 62.4 pounds per cubic foot, lbs/ft3.
• From the given figure pressure at air is:
Step 3

b)Pressure at surface ...

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