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As atmospheric pressure increases, the mercury is forced from the reservoir by the increasing air pressure and the column of mercury rises; when the atmospheric pressure decreases, the mercury flows back into the reservoir and the column of mercury is lowered.
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kids.earth.nasa.gov/archive/air_pressure/barometer.html
kids.earth.nasa.gov/archive/air_pressure/barometer.html
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Atmospheric pressure - Wikipedia, the free encyclopedia
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Atmospheric pressure is sometimes defined as the force per unit area exerted against a surface by the weight of air above that surface at any given point in the Earth's atmosphere. In most circumstan...
en.wikipedia.org/wiki/Atmospheric_pressure
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Atmospheric pressure is defined as the force per unit area exerted against a surface by the weight of the air above that surface. In the diagram below, the pressure at point "X" increases as the weight of the air above it increases.
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ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/fw/prs/def.rxml
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The weight of the air above an object exerts a force upon that object, and this force is called pressure. Variations in pressure lead to the development of winds that play a significant ... Credits and Acknowledgments for WW2010. Department of Atmospheric Sciences (DAS) at the University of Illinois at Urbana-Champaign.
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ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/prs/home.rxml
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The fact that the liquid levels are the same in these three manometers shows that the pressure in the glass manifold above them is uniform. This is under static conditions with no air flow through the system so that all parts of it are at atmospheric pressure.
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hyperphysics.phy-astr.gsu.edu/hbase/pman.html
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Because of the many factors which affect atmospheric pressure. Pioneering scientists discovered atmospheric pressure (also known as barometric or air pressure) in the 17th century, and determined a startling new fact—that air actually has weight.
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www.pbs.org/wgbh/nova/everest/exposure/pressure.html
www.pbs.org/wgbh/nova/everest/exposure/pressure.html
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Figure 7d-1: Change in average atmospheric pressure with altitude. ... Atmospheric Pressure at the Earth's Surface ... Measuring Atmospheric Pressure...
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www.physicalgeography.net/fundamentals/7d.html
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As one ascends, the atmospheric pressure decreases by approximately 1.0 psi for every 2,343 feet. However, below sea level, in excavations and depressions, atmospheric pressure increases. Pressures under water differ from those under air only because the weight of the water must be added to the pressure of the air.
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www.tpub.com/fluid/ch1d.htm
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