Fluid Mechanics

A horizontal pipeline carries water and contracts smoothly from diameter $D_1 = 0.20\text{ m}$ to $D_2 = 0.10\text{ m}$. The steady discharge is $Q = 0.031416\text{ m}^3\text{/s}$ ($= 10\pi\text{ L/s}$). If the static pressure at the larger section is $P_1 = 200\text{ kPa}$, neglecting friction head losses and taking water density $\rho = 1000\text{ kg/m}^3$, the static pressure at the throat section $P_2$ in $\text{kPa}$ is ________ (round off to 1 decimal place).