# Pressure Gradient

## 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.

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