# Normal Pressure Gradient

## Definition - What does Normal Pressure Gradient mean?

Normal Pressure Gradient is the normal pore pressure in a column of fluid within a wellbore. The unit of normal pressure gradient is generally psi/ft or kPA/m (kPA = kilo Pascals). This gradient varies from area to area but generally considered to be around 0.465 psi/ft. The normal pressure gradient for fresh water is 0.433 psi/ft.

## Petropedia explains Normal Pressure Gradient

Normal pressure gradient signifies the rate of pressure change with depth and direction. Also known as normal hydrostatic pressure gradient, pressure gradient is a three dimensional vector quantity measured in Pascal per meter (Pa/m) or kPa/m. As the depth of a borehole increases the pressure also increases. 9.792 kPa/m is the measure of the normal hydrostatic Pressure Gradient for fresh water. The pressure gradient is the major reason of the flow of wind. Normal pressure gradient is usually which is expressed in terms of pressure per unit length.