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Topic: Atmospheric pressure demo

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Standard atmospheric pressure

Barometric pressure

Atmospheric pressure

Pressure

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Standard temperature and pressure

Pressure altitude

Barometric formula

Altimeter

Bar (unit)

Vacuum

Air mass

Flight level

Plenum

	Atmospheric pressure - Facts, Information, and Encyclopedia Reference article
		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.
		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.startsurfing.com /encyclopedia/a/t/m/Atmospheric_pressure.html (1023 words)

	Atmospheric pressure - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-11-06)
		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.
		In terms of city water pressure, one atmosphere is approximately one half to one quarter the pressure of typical city water mains (i.e.
	encyclopedia.worldsearch.com /atmospheric_pressure.htm (930 words)

	Atmospheric pressure - LearnThis.Info Enclyclopedia (Site not responding. Last check: 2007-11-06)
		Low atmospheric pressure systems are symbolized by an L on a weather map and are associated with areas of storminess and precipitation.
		In a high atmospheric pressure system the atmospheric pressure of the air mass is higher than that of the surrounding air.
		High atmospheric pressure systems are symbolized by an H on a weather map and are associated with areas of clear weather.
	encyclopedia.learnthis.info /a/at/atmospheric_pressure.html (357 words)

	Bernoulli's Principle - Advanced Discussion
		Static pressure should not be confused with ram pressure, which is the pressure felt by an object because it is moving relative to the fluid.
		This pressure is dynamic because the fluid is moving relative to the pipe.
		In the demo graph under the Bernoulli's Principle Animation, the red shading corresponds to the static pressure, and the blue shading corresponds to the dynamic pressure.
	home.earthlink.net /~mmc1919/venturi_discuss_math.html (1460 words)

	Movie (Site not responding. Last check: 2007-11-06)
		The pressure of the atmosphere is transmitted undiminished throughout the water even if some of the water is in a tube that is above the level of the water in the tank.
		The atmospheric pressure is the same on both the water in the end of the tube outside the tank and on the water at the top of the tank.
		In this demo the flow is fairly slow because of the friction of the water in the long tube with the walls of the tube.
	www.ac.wwu.edu /~vawter/PhysicsNet/QTMovies/PressureFluids/Siphon.html (283 words)

	Bell in Vacuum (Site not responding. Last check: 2007-11-06)
		For pressures achievable with the roughing pumps we use, about 1/10,000 of atmospheric pressure, the mean free path is about 1 mm.
		The speed of sound is proportional to the square root of the pressure divided by the density.
		Since the density is proportional to the pressure, the velocity of sound is independent of pressure.
	www.physics.ucla.edu /demoweb/demomanual/acoustics/effects_of_sound/bell_in_vacuum.html (293 words)

	Air Pressure
		If there is atmospheric pressure, it should exert a bigger force on the cardboard than the water does and the cardboard should "stick" to the bottom of the glass.
		So atmospheric pressure can change as you go up and down (as you would in a plane) but is always the same when you are the same distance below the top of the atmosphere.
		This indicates that the pressure of the water is the same on both sides of the cup.
	www.physics.ucok.edu /~chughes/~cubscouts/Guides/Pressure.html (1998 words)

	Search Results UIUC Physics Lecture Demos (Site not responding. Last check: 2007-11-06)
		When pressure is applied to the enclosed fluid, it is transmitted to the walls of the hydraulic jack and exerts an upward force on the platform.
		Since the atmospheric pressure is now so much greater than the pressure within, this pushes the hemispheres together, and it requires a very large force to pull the hemispheres apart.
		Since atmospheric pressure is the same in each vase, the fluids will seek their own level, no matter what the shape of the container.
	demo.physics.uiuc.edu /lectdemo/scripts/search_g_result.idc?start=0&end=3&txtAreaID=2&txtTopicID=B (1422 words)

	PSO Lesson: Air Pressure (Site not responding. Last check: 2007-11-06)
		Atmospheric pressure holds down the newspaper and the ruler breaks under the force of the hammer.
		Since there is no air pressure on the inside of the bottle to balance atmospheric pressure, the bottle implodes.
		The air pressure inside is no longer less than atmospheric pressure and the trick fails.
	www.brown.edu /Departments/Swearer_Center/Projects/PSO/Lessons/airpressure.htm (1000 words)

	Pressure
		Pressure is a "scalar".] It is a complex idea, and the words "vector and scalar" will be new to most middle school students.
		Pressure will increase if the area is reduced, as with a sharp point, or edge, and decrease if the area is spread out as with the ladder on the ice.
		Show that the difference in the force down due to the pressure in the liquid at the top of the object and the force up due to the pressure in the liquid at the bottom of the object is equivalent to the weight of the displaced liquid.
	www.neu.edu /reseed/pressure.htm (1160 words)

	3lect39 (Site not responding. Last check: 2007-11-06)
		Pressure is the result of the force of many molecules in motion striking a surface.
		Notice that in both cases, the equilibrium pressure is one atmosphere of pressure.
		The AMPLITUDE is the maximum displacement in pressure away from the equilibrium pressure (usualy atmospheric pressure).
	artemis.cop.uop.edu /~krysac/wagepeace/39notes/3lect39 (765 words)

	Lecture 12/2 (Site not responding. Last check: 2007-11-06)
		Because the lungs are elastic, they will inflate like a balloon if the pressure inside is greater than the pressure outside, and if the pressure inside is equal to or less than the pressure outside, they will collapse to their smallest possible volume.
		Since the lungs are connected to the air which is at atmospheric pressure via the trachea, the pressure inside has to be atmospheric pressure at all times.
		The pressure depends on the depth h and is equal to (rho)gh, where (rho) is the density of water.
	galileo.harvard.edu /galileo/course/lectures11/lect19.html (1487 words)

	Pressure (Site not responding. Last check: 2007-11-06)
		Pressure is a "scalar".] It is a complex idea, and the words "vector and scalar" will be new to most middle school students.
		Pressure will increase if the area is reduced, as with a sharp point, or edge, and decrease if the area is spread out as with the ladder on the ice.
		Show that the difference in the force down due to the pressure in the liquid at the top of the object and the force up due to the pressure in the liquid at the bottom of the object is equivalent to the weight of the displaced liquid.
	www.reseed.neu.edu /pressure.htm (1160 words)

	B
		Vapor pressure - the pressure exerted by a vapor in equilibrium with its liquid
		The pressure of the gas leaving the liquid is sufficient to push back the atmosphere and liquid is converted to solid throughout the liquid (thus bubbling), not just at the surface.
		The vapor pressure is a property of a particular substance whereas the boiling point depends on the atmospheric pressure.
	darkwing.uoregon.edu /~ch111/L20.htm (429 words)

	Atmospheric pressure Details, Meaning Atmospheric pressure Article and Explanation Guide
		Low atmospheric pressure systems are symbolized by an L on a weather map and are associated with areas of storminess and precipitation.
		In a high atmospheric pressure system the atmospheric pressure of the air mass is higher than that of the surrounding air.
		High atmospheric pressure systems are symbolized by an H on a weather map and are associated with areas of clear weather.
	www.e-paranoids.com /a/at/atmospheric_pressure.html (341 words)

	Pressure (Site not responding. Last check: 2007-11-06)
		Since the pressure in your mouth is constantly being made equal to the outside atmospheric pressure, the outside pressure is pressing against itself.
		Since the atmospheric pressure remains great it pushes in through the mouth of the balloon and forces the balloon firmly against the inside of the flask or jar.
		The pressure inside the balloon now is greater that the pressure in the jar and the balloon expands because the trapped air is pushing against the lower outside water pressure.
	www.fortbragg.k12.ca.us /AG/PhysSci/airpress.html (4978 words)

	Physics Demonstration Videos
		When the pressure is distributed over many nails, each individual nail exerts too small an amount to pop the balloon.
		When pressure is applied to the rubber membrane covering the cylinder, more water is forced into the diver, causing an change in its average density.
		The side that is spinning in the direction of the motion will have a higher pressure than the side spinning away, thus the spool will curve to the low pressure side.
	www.wfu.edu /physics/demolabs/demos/avimov/bychptr/chptr4_matter.htm (782 words)

	MIT OpenCourseWare \| Physics \| 8.01 Physics I, Fall 1999 \| Video Lectures \| Video Index for Lecture 33
		The ideal-gas law predicts that the volume of a mole of gas for a given temperature and pressure is independent of the molecular mass of the gas.
		A demonstration of the ideal-gas law uses a pressure gauge that measures overpressure (the pressure in excess of the atmospheric pressure).
		A differential equation is solved to determine that in an isothermal atmosphere the pressure decreases exponentially with altitude.
	ocw.mit.edu /OcwWeb/Physics/8-01Physics-IFall1999/VideoLectures/detail/Video-Segment-Index-for-L-33.htm (733 words)

	The Citizen Scientist
		At the open end, the air pressure is held at atmospheric pressure by the air in the room.
		The effect is to increase the pressure swing in the tube, and increase the amplitude of the sound oscillation.
		In the acoustic laser, the pressure at the closed end is not raised by a piston.
	www.sas.org /tcs/weeklyIssues_2005/2005-05-06/feature3/index.html (983 words)

	Demo: Colbie Bell
		Since the atmospheric pressure is lower, the saturated vapor pressure does not have to be as high for boiling to occur.
		When using a pressure cooker the escape of the water vapor is slowed, causing an increase in atmospheric pressure.
		The boiling point of a substance is defined as the temperature at which the saturated vapor pressure of a liquid is equal to the surrounding atmospheric pressure.
	www.quasar.ualberta.ca /edse456/apt/inquiry/iceboil.htm (546 words)

	Gas Meters
		All positive displacement meters are designed assuming a standard base pressure of sea level atmospheric pressure (14.73 psia), and a PLUS 0.25 psi (7") delivery pressure through the meter.
		This may be acceptable when delivering pressure above 14", but at standard delivery pressure of 7" (0.25 psi) a 2" loss through the meter may mean that gas equipment may not have enough gas pressure to operate, especially when additional gas pipe pressure losses are added in.
		A slight pressure drop across the meter causes the meter and its measurement compartments to rotate.
	www.energytechpro.com /Demo-RES/Mechanical_Systems/Gas_Meters.htm (1804 words)

	[No title]
		Anura & Jim use atmospheric pressure to crush a large 50 gal durm.
		PRESSURE John first uses atmospheric pressure to crush a 1 gallon can then uses liquid nitrogen to uncruch the can can.
		He is pulling against about 200 pounds of force produced by the pressure of the atmosphere.
	www.lhup.edu /gp/PhysicsClub/pc_demof01.htm (542 words)

	POWERLABS' Cryogenic Demonstrations!
		The liquefaction process is very simple: in it, normal, atmospheric air is passed through a dust precipitator and pre-cooled using conventional refrigeration techniques to remove all traces of dirt and water.
		As the liquid vaporizes and the cold gas is warmed to room temperature, the volume expansion results in a great increase in pressure inside the bottle, which quickly builds up to a point where the cork is shot out with a loud "pop", indicating the release of gas.
		Since the pressure of a gas is directly proportional to its temperature, we can assume that all the Nitrogen inside the balloon will contract 235times, leaving the balloon 1/235th of its original volume.
	www.powerlabs.org /ln2demo.htm (1393 words)

	UQ Physics Demo Troupe
		Use this to calculate the average velocity of an air molecule at atmospheric pressure.
		Without air pressure outside the balloon, the pressure of the air inside the balloon is no longer balanced.
		When the external air pressure is returned to normal these popped bubbles will collapse, meaning that the marshmallows return to smaller than their original size.
	www.demotroupe.org /demos/pressure.html (1553 words)

	LECTURE3
		So, the magnitude of atmospheric pressure is similar to placing 3 5-lb sacks of flour (or sugar) on just your two thumbnails.
		Atmospheric pressure can support a column of water about 10 m (33 feet) tall, which makes a pretty unwieldy device.
		Since pressure is proportional to collisions with the walls of the container, the pressure must increase.
	lasp.colorado.edu /~atoc1050/lecture3.htm (1305 words)

	Plasmas
		Under standard atmospheric pressure, you have to use a lot of electricity to generate a plasma path.
		Because the pressure is higher than what is really needed to create plasma, the density of atoms in the gas is higher - making them closer together than in regular plasma.
		The pressures we are looking at now are about two thousand times less than normal atmosphere.
	www.4physics.com /phy_demo/plasma1.htm (853 words)

	Steam Engine History
		Another disadvantage of the pump was the use of steam pressure to expel the water that had been drawn into the tank.
		In principle, pressure could be used to force the water from the tank upwards 80 feet, but boiler explosions were not uncommon since the design of pressurized boilers was not very advanced.
		Atmospheric pressure steam enters the steam cylinder during this step, enabling the process to be repeated.
	www.egr.msu.edu /~lira/supp/steam (1345 words)

	subject
		Rods of different metals, all of the same mass, are used to illustrate the concept of density.
		The pressure of air flowing through a constricted tube is measured at several points (using a water manometer).
		The low pressure produced by fast-moving air is used to explain why objects seem to be attracted to an air source rather than blown away.
	www.phys.utk.edu /demoroom/FLUsindex.htm (264 words)

	Fun With Science Demonstrations (Site not responding. Last check: 2007-11-06)
		This is a set of pressure demonstrations designed to show what will happen when the air around an object is removed, or an astronaut is sent into space (a place with no air) without a space suit.
		This demonstration shows how atmospheric pressure affects poorly designed vacuum systems (this experiment needs to be done outside).
		A strong vacuum pump is used to lower the pressure in a bell jar, which will help to reach a triple point of the water when the 3 states of matter exist simultaneously (for higher grades).
	step.llnl.gov /fws/demo.html (615 words)

	Barometer Demo (Site not responding. Last check: 2007-11-06)
		This lessens the pressure on the surface of the water in the beaker.
		The pressure is likely lower in tornadoes, but tornadic winds would destroy barometers.
		The pressure at the top would be similar to what you would experience near the center of a hurricane with 110 mph winds (Williams page 33).
	formontana.net /baro.html (462 words)

	List of Lecture Demonstrations
		M-HS13 Pressure gauges: A Bourdon gauge and an aneroid gauge.
		M-HS15 Atmospheric pressure: A board extending over the edge of a table and covered by a newspaper at the other end is broken when the free end is struck sharply.
		M-HS20 Atmospheric pressure: Air in a metal can is replaced with water vapor (steam) which is condense back to water thereby creating a partial vacuum, and the can is crushed by external atmospheric pressure.
	learning.physics.iastate.edu /DemoRoom/Index.htm (5754 words)

	Three Hole Bottle Demo
		The surface tension of water is 72 dynes/cm at 25°C. It would take a force of 72 dynes to break a surface film of water 1 cm long.
		The underlying reason is in the way pressure and volume is related in a gas.
		P_o is the pressure outside the bottle, and A is the area of the hole.
	www.csun.edu /~jk850878/dr_herr_assignments/695b/nabila/new_discrepant_event_reviseddw.htm (1356 words)

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