Q$5)$ Helium flows through a $0\mathrm{.}30-$m$-$diameter horizontal pipe with a temperature of $\backslash (20^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash )$ and a pressure of $200$ kPa $($abs$)$ at a rate of $\backslash (0\mathrm{.}30\backslash$mathrm$\{$~kg$\}/\backslash$mathrm$\{$s$\}\backslash ).$ If the pipe reduces to $0\mathrm{.}25-$m$-$diameter, determine the pressure difference between these two sections. Assume incompressible, inviscid flow.