what is atomspheric pressure?
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Atmospheric pressure is the pressure at any point in the Earth's atmosphere.\n\nIn most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. Low pressure areas have less atmospheric mass above their location, whereas high pressure areas have more atmospheric mass above their location. Similarly, as elevation increases there is less overlying atmospheric mass, so that pressure decreases with increasing elevation. A column of air 1 square inch in cross section, measured from sea level to the top of the atmosphere, would weigh approximately 14.7 lb. A 1 m² column of air would weigh about 100 kilonewtons.\n\nStandard atmosphere (symbol: atm) is a unit of pressure and is defined as being precisely equal to 101,325 Pa. This value is intended to represent the mean sea level pressure at the latitude of Paris, France, and as a practical matter, approximates the mean sea level pressure for many of the industrialized nations (those with latitudes similar to Paris). One standard atmosphere is standard pressure used for pneumatic fluid power (ISO R554), and in the aerospace (ISO 2533) and petroleum (ISO 5024) industries.\n\nIn 1982, the International Union of Pure and Applied Chemistry (IUPAC) recommended that for the purposes of specifying the physical properties of substances, “the standard pressure” should be defined as precisely 100 kPa (≈750.062 torr) rather than the 101.325 kPa value of “one standard atmosphere”.[1] This value is used as the standard pressure for the compressor and the pneumatic tool industries (ISO 2787).[2] (see also Standard temperature and pressure)\n\nIn the United States, compressed air flow is often measured in "standard cubic feet" per unit of time, where the "standard" means the equivalent quantity of air at standard temperature and pressure. However, this standard atmosphere is defined slightly differently: temperature = 68 °F (20 °C), air density = 0.075 lb/ft³ (1.20 kg/m³), altitude = sea level, and relative humidity = 0%. In the air conditioning industry, the standard is often temperature = 32 °F (0 °C) instead. For natural gas, the petroleum industry uses a standard temperature of 60 °F (15.6 °C).\n\nAtmospheric pressure is often measured with a mercury barometer, and a height of approximately 760 mm (30 inches) of mercury is often used to teach, make visible, and illustrate (and measure) atmospheric pressure. However, since mercury is not a substance that humans commonly come in contact with, water often provides a more intuitive way to conceptualize the amount of pressure in one atmosphere.\n\nOne atmosphere (101.325 kPa or 14.7 lbf/in²) is the amount of pressure that can lift water approximately 10.3 m (33.9 feet). Thus, a diver at a depth 10.3 meters under water in a fresh-water lake experiences a pressure of about 2 atmospheres (1 atm for the air and 1 atm for the water).\n\nIn terms of city water pressure, one atmosphere is approximately one-half to one-fifth the pressure of typical city water mains (i.e., water pressure is around 2 to 5 atmospheres).\n\nThe most common type of barometer used in homes is the aneroid barometer (Figure 3). Inside this instrument is a small, flexible metal capsule called an aneroid cell. In the construction of the device, a vacuum is created inside the capsule so that small changes in outside air pressure cause the capsule to expand or contract. The size of the aneroid cell is then calibrated and any change in its volume is transmitted by springs and levers to an indicating arm that points to the corresponding atmospheric pressure.
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None!\n\nAtmosphere is made up of Nitrogen (78%), Oxygen (21%),Argon (0.9%) and other gasses e.g Carbon dioxide, Methane, Rare (inert) gases (0.1%)
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Equal atmospheric pressure. Seems like that would be the only shape they could take. Thats my story and I'm stickin' to it!
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air and water vapor\n\ntheir volume depends on temperature and pressure
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(Pardon the Upper Cases - that's how the source has it.\n\n310DB (Normalized)\n\nSOUND PRESSURE CAUSED BAROMETERS TO FLUCTUATE WILDLY AT 100 MILES INDICATING LEVELS OF AT LEAST 170-190 DB (P) AT THIS DISTANCE OF 100 MILES\n\nSOUND COVERED 1 / 10 OF THE WORLDS SURFACE, SHOCK (SOUND) WAVES “ECHOED” AROUND THE EARTH 36 TIMES AND LASTED FOR ABOUT A MONTH!
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A pressure system is a region of the Earth's atmosphere where air pressure is unusually high or low. High and low pressures form (and die) constantly due to thermodynamic interactions of the atmosphere and water in oceans, lakes, and other bodies of water.\n\nLow pressure systems are normally associated with storms unless they are tropical storms or cyclones in which case those symbols are used. High pressure symbols are often associated with fine weather although if the highs are from the arctic it can also be associated with cool weather. Low pressure systems are normally symbolised by L while high pressure systems are indicated by a H.
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Water pressure is the force exerted by water on its surroundings.\n\nOne example is diving under water. At the surface, the air pressure is one atmosphere (atmosphere is a unit of pressure). If you dive 33 feet down, then the pressure is 2 atmospheres. 66 feet is 3 atmospheres, etc. This means, under 33 feet of water, the force exerted on you by the water is double the pressure of air at the surface (which you don't notice because you're used to it ... you only notice when it changes, such as when you go in an airplane and your ears pop).\n\nAnother example is in pipes. Water is pressurized so that it will flow out of your faucet when you open the tap. The air pressure at your sink is one atmosphere. As long as the water in the pipes is pressurized more than one atmosphere, water will flow when you open the tap.
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A pressure is defined to be a measurement of the amount of force acting on an object per unit area\n\nP = F / A   the S.I units for pressure are the N / m^2 which is also called a Pascal (Pa)
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prssure measured in athmosphere
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* ionosphere — the region containing ions: approximately the mesosphere and thermosphere up to 550 km.\n\n* exosphere — above the ionosphere, where the atmosphere thins out into space.\n\n* magnetosphere — the region where the Earth's magnetic field interacts with the solar wind from the Sun. It extends for tens of thousands of kilometers, with a long tail away from the Sun.\n\n* ozone layer — or ozonosphere, approximately 10 - 50 km, where stratospheric ozone is found. Note that even within this region, ozone is a minor constituent by volume.\n\n* upper atmosphere — the region of the atmosphere above the mesopause.\n\n* Van Allen radiation belts — regions where particles from the Sun become concentrated.
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The 'surface' (and I use the term loosely) of gas giants like Neptune is defined to be where the atmospheric pressure is equal to the sea level pressure of Earth.\n\nThis means that the surface is actually gaseous.\n\nFurther down though there is probably a solid core and liquid ocean.
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p=F/A \n\nSo, you have the pressure of the atmosphere pluss the weight of the water above you.  Which is usually figured as a cylinder.  Hope that helps.
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Once air has been set in motion by the pressure gradient force, it undergoes an apparent deflection from its path, as seen by an observer on the earth. This apparent deflection is called the "Coriolis force" and is a result of the earth's rotation.\n\nAs air moves from high to low pressure in the northern hemisphere, it is deflected to the right by the Coriolis force. In the southern hemisphere, air moving from high to low pressure is deflected to the left by the Coriolis force.\n\nThe amount of deflection the air makes is directly related to both the speed at which the air is moving and its latitude. Therefore, slowly blowing winds will be deflected only a small amount, while stronger winds will be deflected more. Likewise, winds blowing closer to the poles will be deflected more than winds at the same speed closer to the equator. The Coriolis force is zero right at the equator.\n\nThis process is further demonstrated by the movie link below. \n\nQuicktime: http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/fw/gifs/coriolis.mov\n\nMPEG\nhttp://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/fw/gifs/coriolis.mpg\n\nThis USA Today website also provides and outstandign explanation and some really good links to further explanations\n\nhttp://www.usatoday.com/weather/resources/basics/coriolis-understanding.htm
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Here's a quick visualization:\n\nhttp://www.chm.davidson.edu/ChemistryApplets/AtomicOrbitals/hybrid.html
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Standard atmospheric pressure is 101 325 Pa = 101.325 kPa = 1013.25 hPa = 1013.25 mbar = 760 Torr. This definition is used for pneumatic fluid power (ISO R554), and in the aerospace (ISO 2533) and petroleum (ISO 5024) industries.
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Barometric pressure is the measure of how dense the air around you is. It is measured in inches or millibars.  The reason for this type of measurement is that early barometers were constructed using a tube of mercury.  it was discovered that a tube containing mercury sitting in a pool of mercury varied with the air pressure.  Scientists noted that this device gave a higher reading at the bottom of a mountain where the air is more dense than at the top where there is less air pressure to support that column of mercury.( if you could keep going higher you would get to a place where there is no air to support your column of mercury.  That is outer space. Say you took an inflated balloon with you on your journey to outer space.  It would explode because there are air molecules inside the balloon pushing outward, and no air pressure outside the balloon to keep it in check. The same with your body.). The average reading at sea level is around 30 inches of mercury.  If you live in a place where there are mountains you can test this for yourself. Most barometers now days do not use mercury, but instead are operated using a spring. Take your barometer with you when you travel up a mountain.  As you get higher you will see the reading decrease. As you travel up or down a mountain, your ears might "pop".  This is due to the change in air pressure. Have you noticed the weatherman talking about areas of low preassure and areas of high presure? The barometric pressure is what they are talking about.  In general the higher the air pressure the less likely there will be a storm. In tornados and hurricanes air pressure is very low. This lower air pressure is what causes some people with arthritus to complain of their aches and pains and causes your headaches. \nSandy Claws
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Atmosphere\nPascal\nBar\nlbs/cm^2