Can anyone here calculate the internal resistance of a length of flexible tubing? I'm thinking about a half-inch diameter (approx 1.2 cm) and 7 feet in length (approx 2m). I understand the relationship of diameter to resistance as the greatest single factor if changed. Ex: reducing the diameter by 50% yields a 16-fold increase in resistance. Also, how much pump would be required to circulate a fluid such as water or alcohol (no highly viscous fluids) thru the 7 foot long loop?
