Helium flows through a \(0.30-\mathrm{m}\)-diameter horizontal pipe with a temperature of \(20^{\circ} \mathrm{C}\) and a pressure of \(200 \mathrm{kPa}\) (abs) at a rate of \(0.30 \mathrm{~kg} / \mathrm{s}\). If the pipe reduces to \(0.25-\mathrm{m}\)-diameter, determine the pressure difference between these two sections. Assume incompressible, inviscid flow.