Pressure gradient:
1.A scale of pressure differences in which there is a uniform variation of pressure from point to point.
For example, the pressure gradient of a column of water is about 0.433 pounds per square inch per foot (9.794 kilopascals per meter) of vertical elevation.
The normal pressure gradient in a formation is equivalent to the pressure exerted at any given depth by a column of 10 percent salt water extending from that depth to the surface 0.465 pounds per square inch per foot or 10.518 kilopascals per meter).
2.
The change (along a horizontal distance) in atmospheric pressure.
Isobars drawn on weather maps display the pressure gradient.
