Question: A long pipe containing air is separated into two sections by a diaphragm. The pressure on one side of the diaphragm is 500 kPa and the pressure on the other side of the diaphragm is 100 kPa, the air temperature being 20°C in both sections. If the diaphragm suddenly ruptures causing a shock wave to move into the low pressure section, and an expansion wave to move into the high pressure section, find the pressure and air velocity in the region between the two waves.