One US gallon is 231 cubic inches.
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1 gallon = 231 cubic inches(8' x 3' x 1') = 24 cubic feet = 41,472 cubic inches = 179.53 gallons (rounded)
5,775 cubic inches in 25 US gallons.
1 gallon = 231 cubic inches Volume of the tank is (10 x 20 x 12) = 2,400 cubic inches The tank has a capacity of (2,400 / 231) = 10.39 gallons (rounded), but we have no way of knowing how many gallons are "in it".
one U.S. fluid gallon is defined as 231 cubic inches. http://en.wikipedia.org/wiki/Conversion_of_units
1 gallon = 231 cubic inchesVolume of a cylinder = (pi) x (radius)2 x (length)Volume of 1-ft of 4-inch pipe = (pi) x (2 inches)2 x (12 inches) = 150.8 cubic inches = 0.653 gallon (rounded)