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As atmospheric pressure pushes down on the surface of the mercury in the cistern, ... In theory, a barometer could be made of any liquid whatsoever. Mercury is chosen, however, for a number of reasons. It is so dense that the column supported by air pressure is of a usable height. A similar barometer made of water,
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www.scienceclarified.com/As-Bi/Barometer.html
www.scienceclarified.com/As-Bi/Barometer.html
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Barometer - Wikipedia, the free encyclopedia
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A barometer is an instrument used to measure atmospheric pressure. It can measure the pressure exerted by the atmosphere by using water, air, or mercury. Pressure tendency can forecast short term ch...
en.wikipedia.org/wiki/Barometer
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A mercury barometer measures air pressure using a column of mercury in a glass tube that is sealed at one end and inverted in a dish of mercury. As air pressure increases, the mercury in the tube rises; conversely, when air pressure decreases, so does the height of the column of mercury. ... Friction slows surface winds,
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wps.prenhall.com/esm_tarbuck_escience_10/3/857/219450.c...
wps.prenhall.com/esm_tarbuck_escience_10/3/857/219450.cw/index.html
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conversely, when air pressure decreases, so does the height of the column of mercury. A mercury barometer measures atmospheric pressure in “inches of mercury”—the height of the column of mercury in the barometer. Standard atmospheric pressure at sea level equals 29.92 inches of mercury. ...
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www4.alief.isd.tenet.edu/cahowe/GMO/GMO%20Chapter%2016%...
www4.alief.isd.tenet.edu/cahowe/GMO/GMO%20Chapter%2016%20Seminar%20Notes%20%20%20%20%20%20Air%20Pressure.htm
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Air pressure is the force exerted by the weight of a column of air above a particular location. ... Under average sea level conditions, the atmosphere exerts enough pressure to push a column of mercury up to the height of 29.92 inches. The aneroid barometer uses an aneroid or sylphon cell to measure pressure.
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www.uwsp.edu/geo/faculty/ritter/geog101/textbook/circul...
www.uwsp.edu/geo/faculty/ritter/geog101/textbook/circulation/air_pressure_p_1.html
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Measuring air pressure : Instead of water, mercury (Hg) is used as a preferred liquid as the density of Hg is 13.6 gm/cm3, hence the height of the liquid column balancing the atmospheric pressure decreases considerably. This we shall see ... Hg is a shining liquid. Reading off the Hg column height from the barometer is easy.
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home.att.net/~cat4a/mechs_V.htm
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A barometer is the instrument used to measure air pressure. ... When air pressure decreases, so does the height of the mercury column. ... A surface low can exist only as long as the column of air above it exerts less pressure than does the air surrounding it.
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www.slideshare.net/basdsci/chapter-19-258138/
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Atmospheric pressure is the amount of force exerted over a surface area, caused by the weight of air molecules above it. A elevation increases, fewer air molecules are present. Therefore, atmospheric pressure always decreases with increasing height. ... A column of air, ... Air pressure can be measured with a mercury barometer,
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www.centennialofflight.gov/essay/Dictionary/Atmos_press...
www.centennialofflight.gov/essay/Dictionary/Atmos_pressure/DI140.htm
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The higher we go in the atmosphere, the less air remains in the column above us. Thus, the atmospheric pressure always decreases with height. Similarly, air density decreases with height, because the overload to compress ... Hydrostatic Pressure – Mercury Barometer ... Figure 3: Surface pressure and density in an air column...
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www.indiana.edu/~geog109/topics/10_Forces&Winds/GasPres...
www.indiana.edu/~geog109/topics/10_Forces&Winds/GasPressWeb/PressGasLaws.html
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