Three different liquidsare used in the manometer shown here. \text { a. Derive an expression for } P_{1}-P_{2} \text { in terms of } \rho_{\mathrm{A}}, \rho_{\mathrm{B}}, \rho_{\mathrm{C}}, h_{1}, \text {

and } h_{2} . D. Suppose fluid A is methanol, B is water, and C is a manometer fluid with a specific gravity of 1.37; pressureP = 121.0 kPa; h= 30.0 cm ; and h2 = 24.0 cm. Calculate P (kPa).