Definition - What does Pressure Gradient mean?
Pressure Gradient is the physical quantity which signifies the rate of pressure change with depth and direction. It is a three dimensional vector quantity measured in Pascal per meter (Pa/m) or kilo Pa/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.
Petropedia explains Pressure Gradient
Pressure Gradient is directed in a downward direction which means that the pressure increases as the depth of the well increases. 9 Pa/m is the strength of the Pressure Gradient in the troposphere. The horizontal Pressure Gradient is the horizontal component of the Pressure Gradient. This horizontal Pressure Gradient can be compared with the 2-D vector that arose due to the components drawn in a local horizontal plane. The normal hydrostatic pressure gradient of a typical Gulf coast water is around 10.516 kPa/m. Pressure Gradient also has a significance with relevance to weather and climate. Air pressure is mainly used in the forecasting.