For laminar flow? For a full pipe? for a 3/4-full pipe? For a 1/2-full pipe? It all makes quite a difference. Please repost your question with a little more information.
It would also help to for us to know the coefficient of friction of the inside of the pipe.
2.5 gallons per minute
That depends entirely on the viscosity of the liquid in the pipe ! Water would flow faster than oil !
Depends on what's flowing (gas or water or something else) and under how much pressure.
that's what she said
The answer depends on the flow rate or the water pressure, not just the pipe size.
10gpm
question cannot be answered because it depends on the water pressure
300 gallons per minute
2.5 gallons per minute
That depends entirely on the viscosity of the liquid in the pipe ! Water would flow faster than oil !
Water flow rate half inch PVC pipe 65 psi?
Depends on what's flowing (gas or water or something else) and under how much pressure.
As many as could flow through before eroding the piping to the point of no more flowing through and it simply spewing about.
As much as you want. But a larger quantity will take longer to pass through the hose.
100
If the flow velocity remains the same the flow volume will increase by the square of the diameter ratio.(2/1.25) = 1.6 = diameter ratio1.62 = 2.56 more flow volume through 2 inch pipe compared to 1.25 inch pipe.
5 Pounds per Square Inch