# Two pressure points in a water pipe are connected to a manometer

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## Two pressure points in a water pipe are connected to a manometer which has the form of an inverted U-tube. The space above the water in the two limbs of the manometer is filled with toluene (specific gravity is 0.875). If the difference of level of water columns in the two limbs reads 12.0 cm, what is the corresponding difference of pressure?

(Take g = 9.81 m/s2)

### Detailed Solution for Civil Engineering Exam

( Pa – Pb ) / Î³w = ( 1 – G2/G1)

( Pa – Pb ) = ( 1 – G2/G1) * Î³w

(Pa – Pb) = ( 1 – 0.875/1 ) * 0.12 * 9810

Pa – Pb = 147.15 N/m2

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