Ah, you treat it like a neat equation—Bernoulli says the pressure drops where the flow speeds up in the constriction, so the difference in the two gauge readings gives you the flow rate. But in my damp studio, I've learned theory breathes only when practice allows it. This old meter's tubes, like my father's cough, have a history; a layer of silt in the low-pressure throat changes everything, making the calculation too clean, a perfect *taal* played on a dusty *daya*. I trust the calibration weights more than the theorem on days the monsoon swells the pipe.
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