Assuming the 6 inches refers to the inner diameter so that the radius is 3 inches,
the capacity of the pipe is pi*r2*l = pi*32*12 = 339 cubic inches approx = 1.47 US gallons.
There is, of course, no way of knowing how much water there is in the pipe except that it cannot be more than 1.47 US gal.
2000 Gallons
0.37 US gallons.0.37 US gallons.0.37 US gallons.0.37 US gallons.
This pipe can hold up to 0.5 cubic foot or 3.7 gallons of water.
111 gallons of water.
598 Imperial gallons, approx.
A three-inch diameter pipe one foot long holds 0.367 gallon.
The capacity of the tubing is 94.6 Imperial gallons, or 113.6 US gallons. There need not be any water in it!
There are about 33.7 gallons in a 3' by 1' by 1'6" aquarium.
About 0.35 cubic feet or about 2.6 gallons.
There need not be any water at all in the pipe. The capacity of the pipe is approx 3.4 Imperial gallons.
2000 Gallons
0.37 US gallons.0.37 US gallons.0.37 US gallons.0.37 US gallons.
0.255 gallons per foot of pipe. A 10 ft long pipe that size holds 2.55 gallons.
This pipe can hold up to 0.5 cubic foot or 3.7 gallons of water.
14.7 gallons of water.
111 gallons of water.
36 cubic feet of water at 6.229 gallons/ cu ft = 224.2 gallons