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Topic: Partial pressure


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In the News (Fri 19 Jul 19)

  
  Dalton's Law of Partial Pressures | World of Chemistry
The pressure exerted by one gas in a mixture of gases is the partial pressure of that individual gas.
Atmospheric pressure is the sum of the partial pressures of all of the gases present in the atmosphere.
The total pressure of the air is the sum of the partial pressures of all of the gases present.
www.bookrags.com /research/daltons-law-of-partial-pressures-woc   (1068 words)

  
  Partial pressure - Wikipedia, the free encyclopedia
The partial pressure of a gas is a measure of thermodynamic activity of the gas's molecules.
Vapor pressure is the pressure of a vapor in equilibrium with its non-vapor phases (i.e., liquid or solid).
A consequence of this is that the total pressure of a mixture of ideal gases is equal to the sum of the partial pressures of the individual gases in the mixture as stated by Dalton's law.
en.wikipedia.org /wiki/Partial_pressure   (1119 words)

  
 Pressure - MSN Encarta
Pressures in the range of millions of kilograms per square centimeter have been obtained for experimental purposes and for the manufacture of artificial diamonds, where pressures of about 70,000 kg/sq cm (about 1 million lb/sq in), together with temperatures in excess of 2770° C (5000° F), are required.
Partial pressure is the term applied to the effective pressure a single constituent exerts in a mixture of gases.
In the atmosphere the total pressure (atmospheric pressure) is equal to the sum of the partial pressures of its constituents (oxygen, nitrogen, carbon dioxide, and rare gases).
encarta.msn.com /encyclopedia_761563312/Pressure.html   (660 words)

  
 Partial pressure
The partial pressure of a gas in a mixture is that which it contributes to the total pressure of the mixture.
The total pressure is equal to the sum of the individual partial pressures of the gases in the mixture:
The partial pressure of a gas is proportional to its mole fraction, which is a measure of concentration.
www.ebroadcast.com.au /lookup/encyclopedia/pa/Partial_pressure.html   (244 words)

  
 Advanced Crew Escape Suit - Wikipedia, the free encyclopedia
The suit is a direct descendent of the U.S. Air Force high-altitude pressure suits worn by SR-71 Blackbird and U-2 spy plane pilots, X-15 and Gemini pilot-astronauts, and the Launch-Entry Suits worn by NASA astronauts starting on the STS-26 flight, the first flight after the Challenger Disaster.
A full pressure helmet with a locking clear visor and a fl sunshade worn to reduce any glare from reflected sunlight, especially during the approach and landing phases of the mission.
Both the pressure faceplate and the sunshade were missing, indicating that they were destroyed either by the hypersonic wind blast when the pressure module was destroyed or by the intense heat.
en.wikipedia.org /wiki/Advance_Crew_Escape_System_Pressure_Suit   (1017 words)

  
 Partial pressure of oxygen sensor-II - Patent 4442420
In particular, the present invention is directed to a partial pressure of oxygen sensor which is inserted into an exhaust system which carries the exhaust gases from a hydrocarbon fuel burning device.
The partial pressure of oxygen sensor is used with appropriate circuitry and mechanical devices associated therewith for controlling the amount of fuel which is introduced into the hydrocarbon fuel burning device.
In accordance with the teachings of a preferred embodiment of this invention, a partial pressure of oxygen sensor, generally identified by the numeral 10, is shown in the drawings.
www.freepatentsonline.com /4442420.html   (3303 words)

  
 Gas Mixtures and Partial Pressures   (Site not responding. Last check: 2007-10-16)
The pressure exerted by a particular component of a mixture of gases
The ratio of the partial pressure of one component of a gas to the total pressure is:
The ratio of the partial pressure to the total pressure is equal to the mole fraction of the component gas
wine1.sb.fsu.edu /chm1045/notes/Gases/Mixtures/Gases06.htm   (476 words)

  
 Oxygen partial pressure measuring device suitably adapted for internal combustion engine exhaust gases - Patent 4240890
A primary object of the invention is, therefore, to provide an oxygen partial pressure measuring device for determining partial pressures in exhaust gases, which eliminates the disadvantages of the hitherto used oxygen partial pressure measuring devices.
The oxygen partial pressure measuring device according to the present invention comprises a monolithic structure and a cylindrical body accommodating therein and fixing thereto an oxygen concentration cell and the monolithic structure such that exhaust gas to be measured reaches said oxygen concentration cell after it has passed through the monolithic structure.
The oxygen partial pressure measuring device according to the invention is so constructed as above described that the exhaust gas including much amount of unburnt gas is burnt when it passes through the monolithic structure and the burnt exhaust gas is adapted to be in contact with the solid electrolyte partition.
www.freepatentsonline.com /4240890.html   (2297 words)

  
 What is the partial pressure of oxygen in a commercial airplane at 30,000 feet?
However this is not practical as the fuselage of a plane would have to be incredibly strong (and hence very heavy and expensive to fly) to withstand the outward force caused by 760 Torr while cruising at 36,000ft.
This explains the phenomenon of 'ears popping' on take-off and landing as the air trapped in the ear is effected by the change in pressure from ground level to this effective altitude.
At ground level, the partial pressure of Oxygen is about 150 Torr (20% of atmospheric pressure at 760 Torr).
www.physlink.com /education/AskExperts/ae504.cfm   (367 words)

  
 Untitled Document
However, should one want to calculate the exact pressure that only the O2 molecules are exerting, one would need to calculate the partial pressure of O2.
One of the best examples of gas pressure in a liquid equalizing with the pressure of that gas in the air, is the example of a can of coke.
A pressure difference is not the only factor that determines the partial pressure of gases in liquids.
sprojects.mmi.mcgill.ca /resp/partial_pressures.htm   (854 words)

  
 PARTIAL PRESSURE   (Site not responding. Last check: 2007-10-16)
Example: the partial pressure of oxygen in a 40% Nitrox mix at 66 fsw is [1 + 66/33] * 0.4 = 1.2 ata.
Example: the partial pressure of nitrogen in a 32% Nitrox mix at 99 fsw is [1 + 99/33] * 0.68 = 2.72 ata.
Example: the partial pressure of nitrogen in air at 80.6 fsw is [1 + 80.6/33] * 0.79 = 2.72 ata.
www.qsl.net /zf2nt/Nitrox/partial_pressure.htm   (126 words)

  
 Reference electrode for electrochemical determination of oxygen partial pressure in an ionic melt - Patent 5580439
As in the case of the Zirconium dioxide-reference electrode the determination of the oxygen partial pressure occurs also by measurement of the EMF E of an electrochemical cell.
The oxygen partial pressure present in the glass melt is obtained in the standard way using equation (1) hereinabove from the EMF 1 measured across electrodes 4 and 6 as indicated in FIG.
The oxygen partial pressure at the metal electrode or the Me.sub.x O.sub.y phase boundary is also calculated from the EMF 2 from equation (1).
www.freepatentsonline.com /5580439.html   (5245 words)

  
 update available
In chemistry, the partial pressure of a gas in a mixture of...
At any given temperature, for a particular substance, there is a partial pressure at which the gas of that substance is in dynamic equilibrium with its liquid or solid forms.
Dalton's Law of Partial Pressure --The total pressure of a mixture of gases is sum of the pressures of the separate gases in the mixture.
www.linux2000.nl /partial_pressure_md5.html   (299 words)

  
 Determination of the partial pressure and the concentration of a gas - Patent 4205913
The present invention relates to a method and circuit arrangement for determining the partial pressure and the concentration of a gas, termed a measuring gas, which is mixed with at least one additional gas according to the optical absorption method.
If gas filters are used, these include a reference filter 11 filled with at least one gaseous component, under high partial pressure, of a gas mixture to be examined and a measuring filter 12 which is evacuated or filled with a gas which does not absorb radiation, such as helium, for example.
For precise measurements of the partial pressures and of the concentrations of gas mixtures, the signal to noise ratio of the detector must be made as large as possible, independently of the measuring principle employed.
www.freepatentsonline.com /4205913.html   (3425 words)

  
 All about humidity
The pressure of a gas can be defined as the sum of the partial pressures created by each of the components entering in the gas composition.
This pressure value is the image of the maximum quantity of a body under its gaseous form which can be found in a gaseous mixture for a given temperature.
The RELATIVE HUMIDITY is defined as the ratio of the partial pressure vapor to saturation vapor pressure at a given temperature.
www.humirel.com /All_about_humidity.htm   (518 words)

  
 Nitrox systems-Frequently Asked Questions about Nitrox, nitrox system, Nitrox systems, Heliar, Trimix, Tri-mix, ...
In fact, there is some suggestion that oxygen may also have some narcotic properties under pressure; thus one should not expect a reduction in narcotic effects due only to the use of nitrox.
Partial pressure blending is the least expensive technique, but it is the most hazardous.
Dalton’s law states, “the total pressure exerted by a gaseous mixture is equal to the sum of the partial pressures of the gasses that make up the mixture.
www.nitroxsystems.com /FAQs.html   (866 words)

  
 ISA | Getting a grip on humidity
If we consider air, this means the total atmospheric pressure of 1.013 bars (14.7 pounds per square inch absolute) is the sum of the partial pressures of all its constituents: nitrogen, oxygen, water vapor, argon, carbon dioxide, and various other gases in trace amounts.
Vapor pressure tables also enable one to look up the saturation vapor pressure for any temperature, and of course there are a number of water vapor calculation programs available for PCs.
This happens because the partial pressure of water vapor, e, increases, but the saturation vapor pressure is still a function only of temperature.
www.isa.org /InTechTemplate.cfm?Section=Departments4&template=/ContentManagement/ContentDisplay.cfm&ContentID=16795   (1008 words)

  
 Lesson 7-4 Dalton's Law
The total pressure in a container is the sum of the partial pressures of all the gases in the container.
are the partial pressures of the gases involved.
If the partial pressures of the oxygen and the hydrogen are 112 kPa and 101 kPa respectively, what would be the partial pressure exerted by the nitrogen.
www.fordhamprep.org /gcurran/sho/sho/lessons/lesson74.htm   (447 words)

  
 Dalton' Law of Partial Pressure
The pressure of a mixture of gases is equal to the sum of the pressures of all of the constituent gases alone.
Dalton's Law explains that the total pressure is equal to the sum of all of the pressures of the parts.
Vapor pressure of water is published in most chemistry books as a table in the appendix, and varies by the temperature of the water.
library.thinkquest.org /12596/dalton.html   (662 words)

  
 Partial Pressure
Pressure times Volume divided by Absolute Temperature is a constant for any sample of gas so we can work out what happens if we heat, cool, compress or anything a constant amount of gas.
Having the same partial pressures does not mean you have the same quantity of gases, just that they are pressing as hard.
Conversly if we want to have a maximum partial pressure of oxygen of 1.5 bar at 35 meters then, as 35m is 4.5 bar total pressure, the fraction of O2 in the gas must be 1.5/4.5 = 0.3333 so 33% max mix.
www.nigelhewitt.co.uk /diving/maths/pp.html   (1465 words)

  
 Raoult's Law and ideal mixtures of liquids
The partial vapour pressure of a component in a mixture is equal to the vapour pressure of the pure component at that temperature multiplied by its mole fraction in the mixture.
The total vapour pressure of the mixture is equal to the sum of the individual partial pressures.
The vapour pressure of pure methanol at this temperature is 81 kPa, and the vapour pressure of pure ethanol is 45 kPa.
www.chemguide.co.uk /physical/phaseeqia/idealpd.html   (2379 words)

  
 PARTIAL PRESSURE -DALTON'S LAW OF PARTIAL PRESSURE
This individual pressure that a gas exerts in a mixture of gases is called it's partial pressure.
the total pressure exerted by them is equal to the sum of their partial pressure".
This expression indicates that the pressure of a gas is proportional to number of moles if confined under similar conditions.
www.citycollegiate.com /daltons_lawXI.htm   (300 words)

  
 Partial Pressure
I have this question about partial pressure, and i'm not entirely sure what it is, and how to solve for it...
Partial pressure, as I remember, is calculated as the ratio of one particular gas' pressure to the total.
Without getting into dictionary circles (partial pressure, mole fraction times total pressure, etc.), "partial pressure" is the pressure exerted by whatever species happens to be of interest in the absence (hypothetical) of all other gas species in the system.
www.physicsforums.com /showthread.php?t=44315   (313 words)

  
 Partial Pressure etc.
Suppose you have a roach in a sealed jar with 0.10 mol of air in it at 1.00 atm (assume chi for oxygen is 0.20 at the start).
After a while, the roach has consumed much of the oxygen and you find that the partial pressure of O2 has dropped to 0.050 atm.
The vapor pressure of water is 0.031 atm at this temp.
homepage.mac.com /ajpelletier/ChemQuiz/PartialPressure.html   (223 words)

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