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Topic: Barometric pressure

	Effects of Barometric Pressure
		How the pressure directly effects the fish is still not fully understood, but knowing how to use the barometric pressure readings can greatly increase your chances of catching fish, especially in shallow and fresh waters.
		Measurement of barometric pressure is accomplished with the use of a barometer.
		Barometric pressure has been used by weathermen since the beginning of meteorology to predict the weather.
	www.quickoneplus.com /fish/barometric.htm (826 words)

	USATODAY.com
		Air pressure is related to its density, which is related to the air's temperature and height above the Earth's surface.
		Air pressure is also called barometric pressure because barometers are used to measure it.
		You need to calculate, sea-level pressure, which is defined as: "A pressure value obtained by the theoretical reduction of barometric pressure to sea level.
	www.usatoday.com /weather/wbarocx.htm (779 words)

	Fly Fishing Science, Barometric Pressure and Fishing - MidCurrent
		A rise or fall in barometric pressure, such as with an approaching cold front, usually means a shift in the weather pattern.
		Pressure, whether in the air or in the ocean, is expressed by scientists as units of “atmosphere.” One atmosphere is defined as the pressure caused by the weight of all the overlying air at sea level—or 14.7 pounds per square inch (psi).
		Atmospheric pressure is often called barometric pressure because it can be measured by the height of the mercury column in a barometer.
	www.midcurrent.com /articles/science/ross_pressure_myth.aspx (1118 words)

	Dealing with your Barometric Pressure Headache — weather the pain storm!
		Looking on the bright side, often barometric pressure headache sufferers at least have a little advance warning, especially if there is a predicted weather front moving in, or if you know you're about to go on a trip.
		Barometric pressure headache may respond particularly well to certain medications or home remedies.
		Barometric pressure headache can be tough to handle.
	www.relieve-migraine-headache.com /barometric-pressure-headache.html (875 words)

	Migraine Barometric Pressure Changes (Site not responding. Last check: )
		I didn't realise that the barometric pressure was causation it until he was in center train.
		What can I do most Barometric Pressure Vexation Look on the undimmed incline much barometric pressure cephalalgia sufferers at smallest take a small betterment warning especially if in that respect is a predicted brave battlefront moving in or if you know you're well-nigh to go on a tripper.
		Barometric pressure and other aspects of the endure temperature extremes humidity are among the relatively ineluctable triggers for migraine.
	www.discountleads.info /migraine-barometric-pressure-changes.html (2148 words)

	Physiological Effects of Reduced Barometric Pressure (Site not responding. Last check: )
		In addition, the relationship of barometric pressure to altitude is influenced by other factors such as distance from the equator and season.
		West and Lahiri (1984) found that direct measurements of barometric pressure near the equator and at the summit of Mt. Everest (8,848 m) were greater than predictions based on the International Civil Aviation Organization Standard Atmosphere.
		Thus, inspired oxygen decreases with increasing altitude due to decreased barometric pressure, as shown in figure 37.5.
	www.ilo.org /encyclopaedia/?doc&nd=857100052&nh=0 (653 words)

	The Weather Network · Glossary Index
		Barometric pressure is the pressure exerted by the weight of the column of air above a given point, expressed in kilopascals.
		Generally speaking, when the barometric pressure is high, the air is sinking, usually resulting in fair weather.
		When the barometric pressure is low or falling, air is rising, usually resulting in cloudy skies and precipitation.
	www.theweathernetwork.com /inter/help/glossary/pages/barometricpressure.htm (56 words)

	Gas Pressure
		The pressure acts perpendicular (normal) to the wall; the tangential (shear) component of the force is related to the viscosity of the gas.
		The pressure measured in the direction of the motion is called the total pressure and is equal to the sum of the static and dynamic pressureas described by Bernoulli's equation.
		Although pressure itself is a scalar, we can define a pressure force to be equal to the pressure (force/area) times the surface area in a direction perpendicular to the surface.
	www.grc.nasa.gov /WWW/K-12/airplane/pressure.html (895 words)

	A BAROMETRIC PRESSURE TIDBIT AND A PERPLEXION (Site not responding. Last check: )
		Barometric pressure is defined as the force per unit area due to earth's atmosphere.
		For example, when the NWS reports a barometric pressure of 1020 mb for Denver, Colorado we know that the actual barometric pressure is much lower than this because of Denver's high altitude.
		Pressure is measured using a sea level reference in order to standardize pressure.
	www.theweatherprediction.com /habyhints/333 (306 words)

	Pressure Sensor Application Notes (Site not responding. Last check: )
		The advantage of using a differential pressure sensor for this measurement instead of two gage sensors is that accuracy is always specified as a percentage of the sensor's full-scale reading.
		You also can use a differential pressure sensor as a gage sensor inside a closed test chamber; you must vent the low or negative pressure port to the outside atmosphere rather than vent it inside the test chamber where the ambient pressure may be different or variable.
		Pressure Sensors of many different types are used in a typical test stand.
	www.sensotec.com /pressure_sensor_appnotes1.shtml (1389 words)

	Barometric Pressure at Race Rocks
		To compensate for this difference in pressure at different elevations, and to facilitate comparison between locations with different altitudes, meteorologists adjust atmospheric pressure so that it reflects what the pressure would be if measured at sea-level.
		For forecasting purposes, the absolute barometric pressure value is generally less important than the change in barometric pressure.
		Barometric pressure is the only physical environmental cue available to a bat roosting deep within a cave.
	www.racerocks.com /racerock/abiotic/barometric/barometric.htm (972 words)

	Barometric Pressure (Site not responding. Last check: )
		Barometric pressure is the pressure exerted by the atmosphere.
		The largest sighting of birds was associated with falling pressure and the smallest sighting was associated with rising pressure.
		In addition, the average number of birds observed during falling pressure was 35.4, and the average number during rising pressure was 27.7 (Figure 1).
	www.birds.cornell.edu /classroombs/Research/2000/baro_pressure.html (383 words)

	Fishing Theories - Effect of Barometric Pressure on Fishing Success. (Site not responding. Last check: )
		It is believed that the effect of barometric pressure is greater in shallow water than deep, probably due to the pressure of the weight of the water in deep water being so high, that the air pressure above it is not relatively significant.
		Frankly, given that the pressure of water depth is such a significantly greater factor than the pressure of atmosphere, it seems likely that the weather conditions created by changes in barometric pressure, such as clouds, rain and wind, have more effect on fishing than the barometric pressure alone.
		So in the opinion of the author, barometric change is a good indicator of fishing change, but it's not because of the pressure change by itself, as much as what other weather conditions are likely to occur because of the pressure change.
	www.thefishingnut.com /link/barometer.html (854 words)

	Answer to "pressure (barometric)" question (Site not responding. Last check: )
		Barometric (or atmospheric) pressure is simply a measure of the amount (weight) of air above a point.
		If meteorologists were to use the actual weather station pressure values in analyzing "surface" weather maps, the pressure pattern would vary with the terrain and the analysis would simply look like the mountains.
		Because temperature is related to the pressure of the atmosphere, meteorologists have to assume a temperature value between the weather station and sea level.
	www.weatherworks.com /monthly/q_and_a/answer_pressure1.html (696 words)

	OutdoorsBest Forums: Fishing and Barometric Pressure
		When the barometric pressure drops, the sharks’ perceptions of how deep they are is altered, she said, which might make them feel unsafe because they think they are in shallow water.
		The barometric pressure at the water surface during a n average hurricane event would be equivalent to a fish moving up about 6 inches in the water column.
		A fish in the atmosphere is subject to an atmospheric pressure of 14.7 PSI The water pressure on a fish at 3 feet assuming a linear incrementation and constant temperature and salinity is (3 X.5) + 14.7 = 16.2 PSI.
	outdoorsbest.zeroforum.com /zerothread?id=560084 (5578 words)

	weather.com - Glossary
		The state of a fluid in which surfaces of constant density or temperature are coincident with surfaces of constant pressure.
		vapor pressure between a liquid and its vapor is equal to the external pressure on the liquid.
		The boiling point of pure water at standard pressure is 100Â°C or 212Â°F. A local name referring to an extremely strong downslope wind in the Front Range of the Rocky Mountains near Boulder, Colorado.
	www.weather.com /glossary/b.html (1130 words)

	Pressure, Barometers, & Barometric Pressure
		The pressure to be measured is connected to one arm of the U while the other is left open to the atmosphere.
		Just as a diver experiences a decrease in pressure as he or she rises toward the surface, we experience a similar decrease in pressure as we climb to higher altitudes in our planes, or climb to the top of a mountain, or go from the basement to upstairs at home.
		The pressure in Honolulu is one of the least variable; the record low is 29.34 recorded in 1936 and the record high is 30.32 recorded in 1905.
	www.challengers101.com /Pressure.html (3670 words)

	How Barometric Pressure may affect the way red fish feed
		Barometric Pressure is one of the most talked about but least understood factors that affect the way fish act.
		Different spices of fish seem to tolerate and adapt to barometric pressure changes in as many ways as there are different fish.
		When the pressure is rising most of the fish I have watched become a little spooky.
	www.sightfishing.com /barometric_pressure.htm (1235 words)

	The Barometric Formula
		Starting at some point in midair, the change in pressure associated with a small change in height can be found in terms of the weight of the air.
		The development of the barometric formula makes use of a number of concepts from kinetic theory, such as the ideal gas law and the associated molecular constants.
		These pressures are considerably below those predicted by the barometric formula, which can be used to calculate variations in barometric pressure with height near the earth.
	hyperphysics.phy-astr.gsu.edu /hbase/kinetic/barfor.html (356 words)

	Barometers and barometric pressure instruments - Vaisala
		Measures humidity, temperature, and barometric pressure in two accuracy classes.
		The Vaisala BAROCAP® Barometer PTB110 is designed both for accurate barometric pressure measurement at a room temperature and for general environmental pressure monitoring over a wide temperature range.
		Minimizes the errors in barometric pressure measurement caused by variations of wind speed and direction.
	www.vaisala.com /instruments/products/barometricpressure (171 words)

	Davis \| Weather
		Vantage Pro2 stations measure barometric pressure, temperature, humidity, rainfall, wind speed and direction, and much more.
		Weather Monitor II stations include barometric pressure, temperature, wind speed and direction, and optional rainfall.
		Stand-alone station measures temperature, humidity, and barometric pressure.
	www.davisnet.com /weather/products/stations.asp (322 words)

	Life History Evolution: Bats and Barometric Pressure
		Studies were conducted to assess the response of a seasonal cave-dwelling bat and its insect prey to natural and experimental changes in barometric pressure.
		In addition, eastern pipistrelles potentially use pressure as a cue for predicting the relative abundance of aerial insect prey from outside the roost while the bat is still roosting within the cave.
		Barometric pressure tracking is viewed as an alternative evolutionary strategy to torpor and may be a widespread phenonmenon among insect-feeding bats that roost deep within caves.
	www.life.uiuc.edu /paige/bats.html (204 words)

	BAROMETRIC PRESSURE
		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.
		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.
		The maximum free-dive is to a depth of 344 ft. At this depth the total pressure on the body is approximately 10 atm.
	www.ac.wwu.edu /~vawter/PhysicsNet/Topics/Pressure/BarometricPressure.html (233 words)

	barometric pressure transmitters,barometric pressure meters,barometric pressure sensors
		The barometric pressure transmitter is fully temperature compensated within an operating range of -40° to 65° C. The barometric pressure sensors are attached to 25’ of marine grade cable, with lengths up to 500’ available upon request.
		The barometric pressure transmitter's output is 4-20 mA with a two wire configuration.
		Barometric pressure transmitters are also used for many other applications including ocean buoys, ships, checking engine performance, airports, and many more.
	www.globalw.com /products/we100.html (292 words)

	It's a Breeze - How Atmospheric Pressure Effects the Weather
		Based on a principle developed by Evangelista Torricelli in 1643, the Mercurial Barometer is an instrument used for measuring the change in atmospheric pressure.
		Air pressure is measured by observing the height of the column of mercury in the tube.
		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.
	kids.earth.nasa.gov /archive/air_pressure/barometer.html (321 words)

	Directory:Barometric Pressure Power - PESWiki
		The pressure difference creates a great deal of wind energy that can theorhetically be channelled through a pipe to produce electrical energy, as air naturally rushes to the lower pressure end of the pipe.
		Between these pressure systems, there are the isobars – those wavy white lines that lie across the space between the two different pressure zones, indicating equal amounts of pressure, which create a pressure gradient (hill) that allows wind to flow naturally from high pressure to low pressure.
		Pipe Pressure - energy technology that harnesses the pressure in pipes such as is found in municipal water pipes.
	peswiki.com /index.php/Directory:Barometric_Pressure_Power (1352 words)

	Water level monitors automatic barometric pressure compensation
		After they had gathered several years of data they were forced to view all of it with suspicion when the purchased a second barometric pressure compensation sensor for the other side of their lake and realized that the two barometric pressure monitoring sites had significant diferences as storms passed over.
		To correctly interpret the data from these types of water level monitors the purchase of an external barometric pressure monitor is required at each site and the elevation for each monitoring site within a system must be determined.
		Purchasing this barometric compensation sensor should not be viewed as optional since even areas with stable pressure throughout the year vary a several millibar and at sea level it is common for pressure variations of around 80 mb or 31” of water level change throughout the year.
	www.globalw.com /support/barocomp.html (846 words)

	Pressure and Vacuum Standards
		The barometric pressure data given on this page is derived from an on-line electronic pressure transducer whose accuracy is determined by regular calibration against the UK's National Standard Barometer.
		Note that, when estimating a pressure value from the graphs, the uncertainty will be considerably higher than that of the measuring transducer because of limitations in screen resolution.
		When using the pressure values, particularly for checking another barometer, it is important to appreciate that the differences in altitude, distance from Teddington and weather conditions may seriously limit the validity of the comparison.
	www.npl.co.uk /pressure/pressure.html (361 words)

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