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1 gallon of water weighs 8.345404 pounds, therefore, 20 gallons weighs 166.90808 pounds. As this is trying to get through a gap of 3.14159265 square inches (Pi times the 1 inch radius squared), then the pressure in pounds per square inch is 166.90808 pounds divided by 3.14159265, which equals 53.128492.

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15y ago
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Q: How much psi is produced at opening when barrel is full 20 gallon water barrel 3 feet off the ground there is a 2 inch diameter opening at the bottom of barrel?
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