For a constant hydraulic stress on an object, the fractional change in the object's volume $\left( {\frac{{\Delta V}}{V}} \right)$ and its bulk modulus $(B)$ are related as
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(b) $B = \frac{{\Delta p}}{{\Delta V/V}}$ $⇒$ $\frac{1}{B} \propto \frac{{\Delta V}}{V}$
$[\Delta p = $constant]
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