A venturimeter along with a differential manometer was installed to measure flow in a water pipeline as shown in the following figure (not drawn to scale).
Taking specific weight of water as $9810 \mathrm{~N} / \mathrm{m}^{3}$, the pressure difference (in Pa, rounded off to one decimal place) between point $\mathrm{Q}$ and $\mathrm{P}$ is ________
