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Two pipes filled with water and caped at one end, they have the same diameter, but different lengths.

One pipe is 10 feet long and the other pipe is 1,000 feet long.

At the other end of both pipes a piston applies an equal amount of pressure on the water in the pipes.

Assumptions:

The pressure within each pipe is equal at every point within the pipe.

The pressure within the 10-foot pipe is higher than the 1,000-foot pipe.

Does anyone know what the equation is that describes this relationship?

Does anyone know where tables & charts are that describe this relationship?