5 Pounds per Square Inch
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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.
A lot
it would flow more easily through a narrow pipe
300mm is a very low head, you can't expect much flow through that pipe, but you can work it out from the mechanical energy balance equation.
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Water flow rate half inch PVC pipe 65 psi?
More, depending on how long you allow the flow to flow.
question cannot be answered because it depends on the water pressure
300 gallons per minute
100
Depends on what's flowing (gas or water or something else) and under how much pressure.
Maximum PSI rating is on the outside rating of the pipe
10gpm
Depending on the time allowed, all the water you want.
That depends entirely on the viscosity of the liquid in the pipe ! Water would flow faster than oil !
what is the discharge flow of 10m/s passing from 2ft pipe