# Pressure Drop

Written by Matt Milbury on . Posted in Pump

The difference in pressure between two points, usually caused by friction resistance in the pipe, but moisture can also affect it.

### Pressure Drop Formula

$$\large{ \Delta p = \frac{f l v^2}{2 g d} }$$

Where:

$$\large{ J }$$ = pressure drop

$$\large{ \mathrm {f} }$$ = friction factor

$$\large{ g }$$ = gravirational acceleration

$$\large{ d }$$ = inside diameter of pipe

$$\large{ l }$$ = lenght of pipe

$$\large{ v }$$ = velocity of the fluid