When the water height hh has the value $3\mathrm{.}50$ mm$,$ the absolute pressure pp of the compressed air is $4\mathrm{.}20105$Pa$4\mathrm{.}20105$Pa$.$ Assume that the air above the water expands at constant temperature, and take the atmospheric pressure to be $1\mathrm{.}00105$Pa$1\mathrm{.}00105$Pa$.$

Calculate the speed of flow for h $=2\mathrm{.}10$ mm$.$