A lot
5 Pounds per Square Inch
4324
A two inch pipe can hold 0.1632 gallons per foot. It takes slightly over 6 feet of two inch pipe to hold one gallon of water.
40
depends on the pressure pushing through the pipe
2 liters
Given enough time the entire ocean could be pumped through a half-inch pipe.
Given long enough, all the water in the world.
Depends on the diameter of the pipe and the speed at which the water travels through it.
300 gallons per minute
question cannot be answered because it depends on the water pressure
None. A square inch has no volume.
There are 12 inches in 1 foot.
orange tacos
Depends on what's flowing (gas or water or something else) and under how much pressure.
zero
4.36 US gallons of water.