1. The problem statement, all variables and given/known data It was a standard venturi meter experiment where we calculated the theoretical and actual mass flow rates for different pressures and velocity's. the follow up questions were: -Compare the results of the coefficient of discharge obtained with typical values given in BS. -Comment on the results for the percentage pressure loss -Comment on the probable sources of any errors in your results 2. Relevant equations my problem is not with the maths or equations but the ones used were the standard for mass flow rate and the coefficient of discharge. also: pressure loss (%) = 100(P1-P11)/P1 3. The attempt at a solution I have completed all the equations and found that both the coefficient of discharge and the percentage pressure loss decrease as the mass flow rate decreases and i was just wondering what the scientific reason for this was? can anyone help?