Pipe is often specified as inside diameter. 2 inch pipe has a 1 inch radius. Assume that the section of pipe is completely full of water.
Cross sectional area = pi*r2 = approx (3.14)*(1 in)2 = 3.14 in2. 1 ft = 12 in, so (12 in)*(3.14 in2) = 37.68 in3, which with 231 in3 in a gallon is about 0.16 gallons, or about 21 fluid ounces.
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2.75 Imperial gallons.
about 25 bucks per foot .
A 12 inch diameter round pipe will hold 4.89 UK gallons or 5.88 US gallons per foot.
40
This pipe can hold up to 0.5 cubic foot or 3.7 gallons of water.