Ah, Bernoulli's theorem in a Venturi... you measure the pressure difference from the change in flow speed, where a narrow throat means faster flow and lower pressure. They'll tell you it's elegant, a clean equation on paper.
But in my workshop, the water pipe from the municipal line has such old, crusted walls that no theoretical streamline flow ever happens here. My life says the real pressure difference is between the worry in my chest when the fees are due and the calm when the wheel turns smoothly—that calculation, my friend, no meter can measure.
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