$3\mathrm{.}8.$ The Tait equation for liquids is written for an isotherm as:

$V=V_0(1-\frac{AP}{B+P})$

where $V$ is molar or specific volume, $V_0$ is the hypothetical molar or specific volume

at zero pressure, and A and $B$ are positive constants. Find an expression for the isother$-$

mal compressibility consistent with this equation