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There are 231 cubic inches per US gallon, or 0.134 cubic feet per US gallon, and 500 gallons x 0.134 cubic feet/gallon would be 66.8 cubic feet in the tank. So if you release a pressurized gas from a 175 psi tank to 14.7 psi (sea-level), the gas will expand to 11.9 times more volume, or 786 cubic feet.
