The cause is weight of the atmosphere.
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Atmospheric pressure is primarily caused by the weight of air above a specific point on the Earth's surface. Gravity pulls air molecules towards the Earth, creating a force that results in atmospheric pressure.
The atmospheric pressure on Earth is primarily caused by the weight of the air above us. Gravity pulls the air downward, creating pressure at the Earth's surface. The mass and density of the air also play a role in determining atmospheric pressure.
Elevation or altitude is the factor that is most commonly corrected for on maps of atmospheric pressure. This correction is necessary because air pressure decreases with increasing altitude, so adjusting for elevation helps to provide a more accurate representation of pressure patterns at the surface.
Tempartures. Temperatures* Savage ^
Total pressure is equal to the sum of gauge pressure and atmospheric pressure. Atmospheric pressure is always present and contributes to the total pressure measurement.
The primary atmospheric factor that affects how a barometer works is air pressure. As air pressure changes, the column of mercury or aneroid capsule in the barometer will move up or down accordingly. Other factors such as temperature and humidity can also indirectly influence barometer readings by affecting air pressure.