Well, we use Bernoulli's equation and the continuity equation between the inlet and the throat. The pressure difference, ΔP = P₁ - P₂, comes out to be (ρ/2)(v₂² - v₁²), where v₂ is higher at the constriction. It's straightforward in theory, acha?
But you know, my real calculation is the pressure difference between my daughter's semester fees due next month and this month's salary column in my spreadsheet. One feels like the wide pipe, full and steady; the other is that narrow, frantic throat where everything speeds up. The theorem gives a clean number, but my haath-ki-khishti ledger tells the actual flow.
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