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In other words, the height, H, gives us a measure of the strength of the atmospheric pressure. If the pressure of the air increases, a little more mercury will be pushed into the tube and H will increase. The instrument shown in the diagram is called a mercury barometer. ... Measuring Pressure Differences...
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www.saburchill.com/physics/chapters/0111.html
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The Earth's atmosphere has pressure and it is not constant. Atmospheric pressure is higher at sea level, and decreases as you go higher up in the atmosphere. Some weather systems have slightly higher pressure than others;
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www.windows.ucar.edu/tour/link=/earth/Atmosphere/measur...
www.windows.ucar.edu/tour/link=/earth/Atmosphere/measuring_press.html&edu=high
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Let's look at how atmospheric pressure is measured. For a long time, atmospheric pressure has been measured by a mercury barometer. The first was invented in 1643 by one of Galileo's assistants. A mercurial barometer has a section of mercury exposed to the atmosphere.
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www.windows.ucar.edu/tour/link=/earth/Atmosphere/measur...
www.windows.ucar.edu/tour/link=/earth/Atmosphere/measuring_press.html
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Air pressure is the force exerted on you by the weight of tiny particles of air (air molecules). Although air molecules are invisible, they still have weight and take up space. Since there's a lot of "empty" space between air molecules, air can be compressed to fit in a smaller volume.
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kids.earth.nasa.gov/archive/air_pressure/index.html
kids.earth.nasa.gov/archive/air_pressure/index.html
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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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www.miami.edu/chem/chm101h/notes/ch12/sld012.htm
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Absolute pressure sensor 104 is utilized for measuring both atmospheric, or barometric, pressure and exhaust back pressure. Particularly, and in one embodiment, sensor 104 is mounted on the same circuit board along with the ECU processor and other components.
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www.freepatentsonline.com/6283107.html
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D3631 -99(2007) Standard Test Methods for Measuring Surface Atmospheric Pressure , aneroid barometer, atmospheric pressure, barometer, barometry, Fortin-type mercurial barometer, mercurial barometer, pressure, ICS Number Code 07.060 (Geology. ... 1.4 Atmospheric pressure varies with time.
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www.astm.org/Standards/D3631.htm
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GS-ENG-04-01: Gas Measuring Apparatus – Atmospheric; Pressure Meter Proving Systems; Version 3.2; Patrick (Pat) J. Hardock, P.Eng. Senior Engineer – Natural Gas Measurement; Engineering and Laboratory Services Directorate;
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www.ic.gc.ca/eic/site/mc-mc.nsf/vwapj/GS-ENG-04-01_e.pd...
www.ic.gc.ca/eic/site/mc-mc.nsf/vwapj/GS-ENG-04-01_e.pdf/$file/GS-ENG-04-01_e.pdf
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