Do not turn the code into an add-in that works only on your machine. Create code for the Churchill Friction Factor equation and verify the code with the data given.

Create Visual Basic function ffactor(Re, rr) that calculates the Darcy- Weisbach friction factor in a pipe or duct, where Re is the Reynolds No and rr is the relative roughness, using Churchill's expression. Verify your results using the data given. Create Visual Basic function ffactor(Re, rr) that calculates the Darcy- Weisbach friction factor in a pipe or duct, where Re is the Reynolds No and rr is the relative roughness, using Churchill's expression. Verify your results using the data given