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Barometric Pressure

Last updated: August 20, 2020

What Does Barometric Pressure Mean?

This is the amount of weight exerted by air in the atmosphere upon the Earth’s surface, which is measured using a barometer. It varies with the rise in altitude that reflects on the mercury column inside the barometer; it also changes with the weather. It is measured in atmosphere (atm), Pascal (Pa), inches of mercury (''Hg), and bars. The weight is as a result of the Earth’s gravitational pull.

In weather forecasting, it is used in the prediction of weather changes in a particular region. In engineering, it determines the melting and boiling points of materials. It is used in wells and standpipe piezometers.


Corrosionpedia Explains Barometric Pressure

In relation to atmospheric pressure in weather forecasting, the pressure keeps the air and vapor gases compact, hence they are not free to move. A lower pressure region is prone to precipitation because the air molecules are free to move, thus causing vibrations and energy. The temperatures required in low-pressure regions are lower as compared to lower altitudes; higher altitudes require more temperature to increase the rate of vibration in those molecules.

Barometric pressure is used in systems like the atmospheric plasma coating processes. Using the atmospheric pressures, the plasma equipment produces a layer of nano coating, which prevents moisture and other impurities from making contact with the substrate. In addition, the barometric pressure will determine the rate of atmospheric corrosion, which is caused by fluctuating normal weather. This prepares designers and engineers with vital information required to develop corrosion resistance solutions.


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