The expression for the bulk modulus is:

$\overline{){\mathbf{B}}{\mathbf{=}}\frac{\mathbf{\u2206}\mathbf{P}}{\mathbf{\left(}{\displaystyle \raisebox{1ex}{$\mathbf{\u2206}\mathbf{V}$}\!\left/ \!\raisebox{-1ex}{$\mathbf{V}$}\right.}\mathbf{\right)}}}$

Hydraulic fluid is compressed by a piston in a cylinder producing a change in pressure of 120 MPa. Before the piston is activated, the hydraulic fluid fills a 16cm length of the cylinder. If the axial displacement of the piston is 8mm, what is the bulk modulus of the hydraulic fluid?

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