Pressure Gradient This changes from high to low.On a map there is an arrow to show this.
{"Image DocumentName": "Air Pressure Definition", "Image ImageDescription": "Air pressure is pressure exerted by the weight of Earth\u2019s atmosphere. At sea level it is equal to pounds per square inch. A barometer is used to measure atmospheric pressure.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}