How does a high vacuum pump work? Can I get a diagram or picture of gas movement through a vacuum system?
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Hope this helps a little bit. Also try links at bottom of article for further research.
365307
Actually, a vacuum cleaner does not suck.  Air is evacuated from inside the cleaner and air pressure of 14 pounds per square inch outside the cleaner is forced up the hose to equalise the pressure difference.  The removal of the air from inside the cleaner is performed at a greater rate than the air rushing up the hose can refill the the cleaner.
463393
Firstly a diffusion pump can't pump from one atm. The system must be pumped down using a conventional pump first. The time it takes depends on many factors such as size and how long the system has been at atmospheric pressure and are there any leaks.
93948
There are molecular vacuum pump motors that spin in the 100's of thousands of revolutions per minute.  I know this doesn't answer absolute highest, but it puts things in perspective.
138012
You could go to the web site how stuff works, there they will give you diagrams of how it works.
489429
One which is not interrupted. This can be done with a reserve tank, for example, as in an "air hose". It can deliver a constant supply of air, from the reserve and then ,as the pressure begins to dissipate, the pump comes back on, keeping the supply constant. The pressure in the tank is maintained at a higher level than at the "regulated" out put.
667559
First off it isn't air in your can.  What you probably have is either propane or butane in the can.  It is a liquid under very high pressure.  However, when it loses its pressure, it expands rapidly, and for it to expand rapidly, it needs HEAT, so it pulls heat from its surroudings to expand.  The absence of heat is cold, so that is why the can freezes up.\n\nThe same principle works in an airconditioner.  The compressor, squeezes the freon gas so it becomes a liquid and gives up heat (outside unit called a condenser blows out hot air).  The liquid freon then travels to an expansion valve or capillary tube where the compressor that is squeezing the freon into liquid is also sucking gaseous freon in on the suction side.  So there is low pressure on the suction side.  The liquid freon from the expansion valve or capillary tube enters this low pressure area and expands rapidly.  As it does, it draws heat to expand, thus pulling the heat from your home and cooling the air.
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1- Float and bucket: this like like your flush box on your toilet, when the condensate accumulates in the bucket, the float goes up and the pressure of the steam behind it pushes the condensate out the pisser.\n\n2- Thermodynamic traps: this works like the thermostat on you car radiator..the condensate temperature contracts the liquide in the bellows and a pin unblocks the pisser till the condensate leaks out. The steam hits the bellows, expands it and the pin blocks the pisser.\n\n3- Inverted bucket traps: simmilar to float and bucket but works in the opposit sense...O, thats enough for tonight. Hope you learned somthing...you can go to spyraxsarco.com and get the nitty grittys
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A perfect vacuum (on earth) equals (-)14.7 psig.  You can not produce a stronger vacuum.  For example, when you press a suction cup against glass, you must pull with a force of 14.7 pounds for every multiple or fractional square inch of effective surface of the suction cup.  If it has an area of one square inch you must pull with 14.7 pounds of force, against the pressure of the atmosphere, to pull it free.  At the bottom of a swimming pool you would have to pull that much plus the weight of a column of water one square inch in cross-section times the depth.\n\nFor your vacuum cleaner you can easily determine its suction "power" by using it to suck water up a long clear plastic tube.  A perfect vacuum would suck up a water column about 34 feet high (depending on barometric pressure) but a typical vacuum cleaner would likely produce a column about six feet tall.  If you measure the column in "inches of water" you will have your vacuum rating, e.g., 72-inch w.c. (water column) and can use the procedure to rate various vacuum cleaners.  Caution: the tube must be tall enough to avoid sucking water into the vacuum cleaner (and shorting it out?) and let the water out with the vacuum off (if the tube is on the ground the water will suck right into the vacuum cleaner!).  Also do not run the vacuum cleaner too long without air flow which cools the motor or you will burn out the motor.  Good luck.
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Outside the house you have a condenser unit with a compressor.  The compressor compresses freon gas and that makes it hot.  The condensor then removes the heat and turns the freon into liquid.  That is why the outside unit blows out hot air.  The liquid freon then goes to the evaporator inside the house.  In the evaporator, there is a thing called the thermostatic expansion valve or some capillary tubes (very small).  The liquid freon discharges through the TEV or capillary tubes and when it does, it expands in the presence of the suction from the compressor to form a gas.  As it forms a gas it draws heat from its surroundings to do that.  That is why the evaporator gets cold.  The cold freon gas is then sucked through the coils in the evaporator where it draws heat from the air coming across them back into the compressor, where the compressor compresses the cold gas and it gets hot again, and the cycle repeats itself over and over as the unit runs!
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air would rush into the empty tube and filll the vaccum and some may escape in to space but not very much.\n\nTake a straw and plug the top insert it into a glass of water - remove your finger. if your straw wa almost all the way under you will shoot a little water in the air but the cupp will not empty - physical principles are the same
76253
Hope you find this helpful read through it its pretty basic but it will a good idea of how they work\n\nhttp://www.howstuffworks.com/fuel-cell.htm
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Go here....\n\nhttp://entertainment.howstuffworks.com/paintball1.htm\n\nand go here......\n\nhttp://www.ottersccustoms.com/works.html\n\nBasically C02 or Air comes from your tank into a regulator then into the front valve, when you pull the trigger the bolt and striker move forward, the striker pushes open the vale for a split second letting the C02 or air up into and through the bolt which blows the paintball out of the barrell. Read the articles. Pretty good I think.
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There are different types of head.\n> SUCTION HEAD (hs):Vertical height of the centre line of the pump above the liquid surface in the pump from which the liquid is being lifted.\n> Delivery head (hd):Vertical height of the liquid surface in the tank to which the liquid is delivered above the centre line of the pump.\n> STATIC HEAD (Hs): sum of the suction head and delivery head. Hs = hs + hd.\n>Manometer head (Hm):head against which pump has to be work. Hm = hs + hd + hfs + hfd + v^2d/2g.(v^2= v square).\nhfs = friction head loss in suction pipe.\nvfd = friction loss in delivery pipe.\nv^2d/2g = velocity head in delivery pipe.\nHm = ( total head at the outlet of the pump) - (total head at the inlet of the pump).
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You might work up some Q&A while showing this old demo of the effect of atm pressure...thereby adding some visual interest to the subject.\n\nAdd a few oz of water to a square-sided, metal, one-gallon can having a tightly fitted cap...bring to a vigorous boil (cap now off, please :-))..) and continue boiling until all air is expelled...screw cap in place and allow to cool...they will see the can collapse.\n\nWork up questions about the vacuum thus created (by the condensation of the water vapor) allowing atm pressure to exert its force.
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Basically, heat is absorbed from the hot room by a refrigerant liquid which expands into a gas.  When things expand, they absorb heat, so this cools the room.  The gas then goes to a compressor, which squishes it back into a liquid.  It only has to increase the pressure (the temperature goes up too), and send it to a set of coils outside.  The room heat, plus the heat from the compressor is lost to the atmosphere.  You then have a cool liquid to send back to the room coils.\n\nok.  You've moved a lot of heat around, but you only had to do a bit of compression and pumping.  You put in a little work, and got a lot of cooling out of it.  We have a measure of this, called the coefficient of performance, or COP.  In this case 3500/1500 is about a 2.3, which isn't all that great.  3500/800 is about 4, which is a little better.  Try for more like 5 to 7.\n\nA more thorough explanation would require some thermodynamic charts.  You might want to look up the air conditioning cycle using your favorite search engine.  It will take a bit to understand the whole thing.  If you are really interested in this, I would recommend a nice four year course in engineering.
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well if i am not wrong.. they work on the principle of thermionic emission... \n\nnow wat happens is ... at the cathode end ( negatively charged) there is a metal bit.. called emitter  and at the anode end( positive terminal) another metal called the receiver. the tube is vacuated and filled with gas, in this case a halogen vapour. \n\nwat happens is when a potential is applied, when we switch it on, the cathode emits electrons.\nthese electrons pass thru the vapours and ionise them. when ionised these gases emit energy in the form of light..\n\nthis is the explanation in the most condensed form... equations make it complicated for understanding... \n\nhope i did justice to ur query