In the last chapter you have learned about the impulse balance and it’s usage. You can set up an impulse balance over a variety of situations and know what the role of the force balance is inside of the impulse balance. Well done!

In this chapter we will together derive the Fanning equation from the impulse balance. That equation links the pressure drop due to friction inside horizontal straight pipes to a number of variables. Which variables? That is what you are going to find out in this chapter.

Good luck!