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Barometric pressure was discovered in about 1644 when physicist and inventor Evangelista Torricelli invented the first mercury barometer. Torricelli was an assistant to Galileo Galilei who suggested that Torricelli try using mercury in his vacuum experiments. As Torrice...


An area is considered to have high barometric pressure when it has greater atmospheric pressure than the surrounding area. Normal barometric pressure is between 980 millibars and 1,050 millibars. High pressure systems are also referred to as anticyclones.


Barometric pressure normally fluctuates. Rises in pressure can be linked to clear weather. Falling pressure can be linked to wet weather or storms. Steady barometric pressure readings indicate that the current conditions will continue. Did you know that air has weight? ...


Barometric pressure of under 29.50 inches of mercury at sea level is considered low. At sea level, a normal barometer reading is between about 29.70 inches of mercury and 30.20 inches.


Barometric pressure, or air pressure, is lowest at high altitudes. However, barometric pressure also varies according to the weather. The lowest barometric pressures have been recorded during strong tropical cyclones.


Low barometric pressure is caused by warm air from the planet's surface rising, decreasing the amount of air pulled downward by Earth's gravity. This rising heat can lead to adverse weather conditions.


A barometric pressure sensor measures pressure differences in the atmosphere. In automotive applications, this reading is used by the powertrain control module to regulate engine timing and fuel trim.