The pressure in the oil (S = 0.86) pipe is 12 kPa. The pressure

Question

Quizplus · Accepted Answer

$- 13.1 \mathrm { kPa }$
Place " $a$ " and " $b$ " as shown. Then $p _ { a } = p _ { b }$ since $a$ and $b$ are at the same elevation in the same fluid. The manometer then tells us that
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$$\begin{array} { c } 
p _ { a } = p _ { b } \
p _ { \text {oil } } + ( 0.2 + 0.08 ) \times 9810 \times 0.86 = p _ { \text {water } } + 0.08 \times 9810 + 0.2 \times 9810 \times 13.6 \
\therefore p _ { \text {water } } = 12000 + 2362 - 785 - 26683 = - 13110 \mathrm {~Pa} \text { or } - 13.11 \mathrm { kPa }
\end{array}$$

The Pressure in the Oil (S = 0