I have been told to calculate the pressure drop between two points in a pipe carrying water using a U-tube manometer. I understand that the pressure drop (P(adsbygoogle = window.adsbygoogle || []).push({}); _{1}- P_{2}) is given by pgh and that h is the difference in manometer fluid levels and g is gravity, but is p the density of the manometer fluid or the water flowing through the pipe?

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# U tube manometer

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