Approx 21.2 cubic inches.
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A 100-foot pipe with a 6-inch diameter has a volume of: 19.63 cubic feet.
A pipe with an inside diameter of 2 inches has 37.7 cubic inches (rounded) of interior volume per foot. That means about 6feet 1.5inches per gallon.
Assuming that 0.75 inch refers to the diameter, the volume is pi*(0.75/2)2*12 = 5.3 cubic inches, approx.
Pipe is generally cylindrical and the dimension refers to the inside diameter. One cubic foot contains 7.48 gallons. The volume of a one foot long 20" diameter pipe is: pi(1.667/2)^2 = 2.18 cubic feet. At 7.48 gallons per cubic foot the total volume is 16.3 gallons.
I'm assuming that "4 inch" is the inside diameter of your pipe.Then its volume is roughly-- 0.6528 gallon per foot-- 1.9584 gallon per yard-- 3.264 gallons per 5 feet.etc.