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Topic: Standard atmospheric pressure

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	Atmospheric Pressure
		Pressure is a force, or weight, exerted on a surface per unit area, and is measured in Pascals (Pa).
		The pressure exerted by a kilogram mass on a surface equals 9.8 Pa. The pressure exerted by the whole atmosphere on the Earth’s surface is approximately 100,000 Pa. Usually, atmospheric pressure is quoted in millibars (mb).
		A mercury barometer measures the pressure by noting the length of mercury which is supported by the weight of the atmosphere.
	www.ace.mmu.ac.uk /eae/Weather/Older/Pressure.html (421 words)

	Atmospheric pressure - Biocrawler (Site not responding. Last check: 2007-10-31)
		Standard atmospheric pressure or "the standard atmosphere" (1 atm) is defined as 101.325 kilopascals (kPa).
		Atmospheric pressure varies widely on the Earth, and these variations are important in studying weather and climate.
		Atmospheric pressure is often measured with a mercury barometer, and a height of approximately 30 inches of mercury is often used to teach, make visible, and illustrate (and measure) atmospheric pressure.
	www.biocrawler.com /encyclopedia/Atmospheric_pressure (1100 words)

	Atmospheric pressure - Wikipedia, the free encyclopedia
		Standard 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, truly reflects the mean sea level pressure for many of the industrialized nations (those with latitudes similar to Paris).
		In 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).
	www.wikipedia.org /wiki/Atmospheric_pressure (1469 words)

	NationMaster - Encyclopedia: Atmospheric pressure (Site not responding. Last check: 2007-10-31)
		Standard atmospheric pressure or "the standard atmosphere" (1 atm) is defined as 101.325 kilopascals (kPa) or 760 mmHg.
		When expressed as a measurement, an atmosphere (symbol: atm) or standard atmosphere is a unit of pressure roughly equal to the average atmospheric pressure at sea level on Earth.
		This "standard pressure" is a purely arbitrary representative value for pressure at sea level, and real atmospheric pressures vary from place to place and moment to moment everywhere in the world.
	www.nationmaster.com /encyclopedia/Atmospheric-pressure (3207 words)

	Atmospheric pressure - Wikipedia, the free encyclopedia
		Atmospheric pressure is the pressure above any area in the Earth's atmosphere caused by the weight of air.
		Air masses are affected by the general atmospheric pressure within the mass, creating areas of high pressure (anti-cyclones) and low pressure (depressions).
		Atmospheric 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.
	en.wikipedia.org /wiki/Standard_atmospheric_pressure (1469 words)

	Atmospheric pressure (Site not responding. Last check: 2007-10-31)
		Standard atmospheric pressure or "the standard atmosphere " (1 atm) is defined as 101 325 pascals = 101.325 kPa.
		In a low atmospheric pressure system the atmospheric pressure of the air is lower than that of the surrounding Low atmospheric pressure systems are symbolized by L on a weather map and are associated with areas of and precipitation.
		In a high atmospheric pressure system the atmospheric pressure of the air is higher than that of the surrounding High atmospheric pressure systems are symbolized by H on a weather map and are associated with areas of weather.
	www.freeglossary.com /Atmospheric_pressure (694 words)

	Standard atmospheric pressure - Hutchinson encyclopedia article about Standard atmospheric pressure
		Pressure at any point on the Earth's surface that is due to the weight of the column of air above it; it therefore decreases as altitude increases, because there is less air above.
		At sea level the average pressure is 101 kilopascals (1,013 millibars, or 760 mm Hg, or 14.7 lb per sq in, or 1 atmosphere).
		A standard measurement for atmospheric pressure at sea level is a column of mercury 760 mm/30 in high.
	encyclopedia.farlex.com /Standard+atmospheric+pressure (387 words)

	Pressure
		Since static fluid pressure is determined by the fluid density and depth, the depth or height difference of a given liquid is commonly used for pressure measurement:
		The fundamental SI unit of pressure is the Pascal (Pa), but it is a small unit so kPa is the most common direct pressure unit for atmospheric pressure.
		Since the static fluid pressure is dependent only upon density and depth, choosing a liquid of standard density like mercury or water allows you to express the pressure in units of height or depth, e.g., mmHg or inches of water.
	hyperphysics.phy-astr.gsu.edu /hbase/pman.html (538 words)

	Atmospheric Sciences Encyclopedia Article @ LaunchBase.com (Launch Base) (Site not responding. Last check: 2007-10-31)
		Atmospheric sciences is an umbrella term for the study of the atmosphere, its processes, the effects other systems have on the atmosphere, and the effects of the atmosphere on these other systems.
		Climatology is the study of atmospheric changes (both long and short-term) that define average climates and their change over time, due to both natural climate variability and anthropogenic climate variability or global warming.
		Atmospheric science has been extended to the field of planetary science and the study of the atmospheres of the planets of the solar system.
	www.launchbase.com /encyclopedia/Atmospheric_sciences (234 words)

	Atmospheric Reentry Encyclopedia Article @ LaunchBase.org (Launch Base) (Site not responding. Last check: 2007-10-31)
		Atmospheric reentry is the process by which vehicles that are outside the atmosphere of a planet can enter that atmosphere and reach the planetary surface intact.
		Atmospheric reentry was successfully developed, which made possible nuclear-armed intercontinental ballistic missiles.
		For example, in the case of the Galileo Probe's entry into Jupiter's atmosphere, the shock layer was mostly in equilibrium during peak heat flux due to the very high pressures experienced (this is counter intuitive given the free stream velocity was 39 km/s during peak heat flux).
	www.launchbase.org /encyclopedia/Atmospheric_reentry (7646 words)

	Atmospheric Pressure
		The pressure exerted by a kilogram mass on the Earth's surface is approximately 10 Pa. The pressure exerted by the whole atmosphere on the Earth’s surface is approximately 100,000 Pa.
		Sometimes, atmospheric pressure is quoted in millimetres, centimetres or inches of mercury.
		Variations in atmospheric pressure lead to the development of winds that play a significant role in shaping our daily weather.
	www.ace.mmu.ac.uk /eae/Atmosphere/Older/Pressure.html (234 words)

	Atmospheric Pressure...Meteoroloo.com
		Standard atmospheric pressure or "the standard atmosphere" (1 atm) is defined as 101.325 kilopascals (kPa).
		However, this standard atmosphere is defined slightly differently: temperature = 68°F (20°C), air density = 0.075 lb/cu ft, altitude = sea level, and relative humidity = 0%.
		The highest recorded atmospheric pressure, 1085.7 millibars (32.06 inches of mercury), occurred at Tonsontsengel, Mongolia, 19 December 20012.
	www.meteoroloo.com /atmosphericpressure.html (852 words)

	Flow Glossary by Lenox Laser the leader in small hole technology
		Gauge Pressure - is pressure measured above atmospheric pressure, while absolute pressure is pressure measured above perfect vacuum as a base.
		Reference to vacuum conditions is often made by expressing the absolute pressure in inches of mercury; also millimeters of mercury and microns of mercury.
		Standard atmosphere, atmospheric pressure, standard conditions, vacuum, weight density, density.
	www.lenoxlaser.com /tech_ref/flow_glossary.html (443 words)

	NOVA Online \| Surviving Denali \| Pressure on Earth
		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.
		Evangelista Torricelli, one of the first to discover atmospheric pressure, once said, "We live submerged at the bottom of an ocean of the element air." The Earth's gravitational field is pulling on air, and this pull, or "pressure" of air, is called atmospheric pressure.
		Standard altitude-pressure tables allow mountaineers and aviators to determine their approximate height by measuring atmospheric pressure.
	www.pbs.org /wgbh/nova/denali/extremes/pressure.html (542 words)

	Pressure
		The surface of the earth is at the bottom of an atmospheric sea.
		The standard atmospheric pressure is measured in various units:
		The mercury barometer is the standard instrument for atmospheric pressure measurement in weather reporting.
	hyperphysics.phy-astr.gsu.edu /hbase/pman.html#atm (538 words)

	This Week's Forecast May Be A Heart Attack
		Extremes of pressure were associated with increased risk of heart attack regardless of whether the change in pressure was higher or lower.
		The study was not designed to determine the reason that changes in temperature and atmospheric pressure might affect the risk of heart attack.
		Previous studies have linked changes in atmospheric pressure to an increase in the likelihood of a hemorrhagic stroke, one that is caused by bleeding in the brain, says Amouyel.
	www.eurekalert.org /pub_releases/1998-11/AHA-TWFM-091198.php (899 words)

	Pressure (Site not responding. Last check: 2007-10-31)
		Pressure (P) is the force (F) which acts on a given area (A) The gas in an inflated balloon exerts a pressure on the inside surface of the balloon
		The mercury is pushed up the tube until the pressure due to the mass of the mercury in the column balances the atmospheric pressure
		A manometer is used to measure the pressure of an enclosed gas.
	wine1.sb.fsu.edu /chm1045/notes/Gases/Pressure/Gases02.htm (438 words)

	Pressure (Site not responding. Last check: 2007-10-31)
		The pressure of a system is defined as the force exerted by the system on unit area of its boundaries.
		Often in measurements a gauge is used to record the pressure difference between the system and the atmospheric pressure.
		Standard atmospheric pressure=1.01325 bar= 101325 Pa In hydraulic "m of water" is common:
	www.taftan.com /thermodynamics/PRESSURE.HTM (116 words)

	Air pressure and wind
		Wind results from a horizontal difference in air pressure and since the sun heats different parts of the Earth differently, causing pressure differences, the Sun is the driving force for most winds.
		That is, if the stations are far apart and the pressure difference is great, then the winds will be less than if the stations were close together and the pressure difference where the same.
		If the PGF forces winds from high to low pressure and the Co deflects the winds, there may come a time when the winds are deflected 90° from their initial direction, directly toward the low pressure system.
	www.ux1.eiu.edu /~cfjps/1400/pressure_wind.html (1920 words)

	Ch-4, Part-1: Atmospheric Pressure and Its Measurement
		Atmospheric pressure is the weight of the atmosphere per unit of area on which it rests.
		The movement of the sides of the canister are transmitted, mechanically, to a pointer that indicates atmospheric pressure on the faceplate of the instrument.
		of atmospheric pressure as measured in "inches of mercury" on a barometer.
	www.sci.uidaho.edu /scripter/geog100/lect/04-atmos-oceanic-circ/ch4-part-1-pressure.htm (858 words)

	Pressure
		The atmospheric pressure is the pressure in the surrounding air.
		The Standard Atmospheric Pressure (atm) is used as a reference for gas densities and volumes.
		The Normal atmospheric pressure is 14.696 psi, meaning that a column of air on one square inch in area rising from the Earth's atmosphere to space weights 14.696 pounds.
	www.engineeringtoolbox.com /pressure-d_587.html (834 words)

	BAROMETRIC PRESSURE (Site not responding. Last check: 2007-10-31)
		Ordinary air pressure is the weight of a column of air that extends to the top of the Earth's atmosphere divided by the cross-sectional area of the column.
		C the height of a Mercury column supported by air pressure is 760 mm under normal conditions.
		In the case of a Mercury Barometer the pressure exerted by 760 mm column of mercury is the same as that of a column of air extending to the top of the atmosphere.
	www.ac.wwu.edu /~vawter/PhysicsNet/Topics/Pressure/BarometricPressure.html (233 words)

	NOVA Online \| Everest \| 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.
		Because of these variations, two mountaineers climbing at the same altitude but on different mountains could experience different atmospheric pressures and therefore different physiological effects.
		Only one direct measurement of atmospheric pressure has ever been made on the summit of Mt. Everest, in 1981.
	www.pbs.org /wgbh/nova/everest/exposure/pressure.html (571 words)

	Standard atmosphere - Wikipedia, the free encyclopedia
		The standard Atmospheric pressure -- a reference value at sea-level
		The US Standard Atmosphere -- a series of models that define values for pressure, density, and temperature over a range of altitudes
		The International Standard Atmosphere (ISA) -- an international standard model, defining typical atmospheric properties with altitude, at mid-latitude.
	en.wikipedia.org /wiki/Standard_atmosphere (119 words)

	The Open Door Web Site : IB Physics : Thermal Physics : Measuring Atmospheric Pressure
		The pressure of the atmosphere (represented by the red arrows) keeps the mercury in the tube.
		In this case, the mercury falls until the pressure due to the weight of the mercury column (acting at the level of the surface of the mercury in the reservoir) is just equal to the pressure exerted by the atmosphere.
		If the pressure of the air increases, a little more mercury will be pushed into the tube and H will increase.
	www.saburchill.com /physics/chapters/0111.html (275 words)

	atmospheric pressure
		At mospheric pressure is measured in millibars, bars, or atmospheres.
		The standard atmospheric pressure at the surface of the Earth is 1,013 mb.
		On Venus the surface pressure is about 90,000 mb (90 bars), while on Mars it is about 7.5 mb.
	www.daviddarling.info /encyclopedia/A/atmospres.html (132 words)

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