Question:
I mean then p1p2 how?
Answer:
We know that Pressure = Force / Unit Area. That is, P = F/A
Let us consider two difference area of cross-sections as in the case of Venturimeter application. Then P1 is inversely proportional to A1 and P2 is inversely proportional to A2.
Hence, P1 / P2 = A2 / A1
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