1. The problem statement, all variables and given/known data Water flows through venturi tube at 0.3 litres/s. Diameter of venturi tube is 32mm to 20mm to 32mm and the water density is 1000kg/m^3. 2. Relevant equations a) Assuming head loss is neglible, what is pressure difference between 1 and 2. b) If pressure head difference between these is 45mm what is head loss. 3. The attempt at a solution So far I have V2 = P1A1V1/P2A2 = 0.9548 and V1 (Q/A) = 0.3731 delta H 1/2 = H1 - H2 = 1/2g (V2^2-V1^2)) delta H 1/2 = 39.3mm Where do I go from here, if this is even correct ? Thanks a lot for your help.