A fluid with a density of $999\mathrm{.}2$ kg$/$m$3$ is flowing in a $6\mathrm{.}62$ cm inner diameter horizontal pipe with $0\mathrm{.}025$ m$3/$s$.$

Calculate the pressure difference between the manometer arms.Take orifice coefficient C$0=0\mathrm{.}61,$

$=($D$0/$D$1)=0\mathrm{.}67,\backslash$rho B$=7000$kg$/$m$3$