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Let me take a stab at the original question - as far as I can remember it. As usual, the thread evolved into something different - probably because no one had a good response to the question.The example given was flowing air, where the normal pressure on the pipe walls is reduced.
Pressure comes from the momentum change of the molecules of a gas when they hit the walls of a container. The question was "what is happening at the molecular level to explain the reduction in pressure as a gas flows from a large diameter pipe into a smaller one?". Specifically, I think the question was asking about the component of velocity of the molecules perpendicular to the pipe walls - was it reduced? - and by what mechanism was it reduced?
Bob at PC