We will now investigate the phenomenon in a situation where the cross-section of a pipe (e.g., a pressure line) decreases. For this, we can start from the principle sketch of a Venturi tube. Meter entrance Venturi meter 2 Meter exit A Pipe -Manometer Pipe Bernoull Let's assume that the cross-section A is to be equal to 5a (i.e., we assume that the area of the pressure line decreases by a factor of 5). Furthermore, assume that the pressure p1 at the large cross-section (pump side) is 3.0 atm and that p2 at a has dropped to zero (p2=0, cavitation occurs!). a) Calculate the liquid's velocity v1 at A and v2 at a under the condition that we pump fresh water (p = 1 g/cm).. b) Calculate the volume flow rate of the pressure line (in liters/s) if the diameter at A is 5.0 cm.