Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Pressure gradient ( $$p_g$$ ) (dimensionless number) describes which direction and at what rate the pressure changes the most at a specific location.

$$\large{ \frac { d p } { d x} \; = \; \frac { \Delta p } { \Delta x } }$$

Where:

$$\large{ d }$$ = differential

$$\large{ x }$$ = distance

$$\large{ \Delta x }$$ = distance differential, distance between pressures

$$\large{ p }$$ = pressure

$$\large{ \Delta p }$$ = pressure differential, high - low pressure