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Xonkra Gallente	Posted - 2008.02.08 16:27:00 - [1] ok so lets say you got a pipe running from earth to the moon. if both ends would be open would the end on the earth side suck air into it ? Originally by: Illyria Ambri No matter how you want to say it.. it always sounds like frog clearing throat "Ve zurrendur, dunt schuut"
lofty29 Reikoku Band of Brothers	Posted - 2008.02.08 16:33:00 - [2] Yes. In theory 族---族 Latest Video : Relentless
TheWench	Posted - 2008.02.08 16:34:00 - [3] Originally by: lofty29 Yes. In theory Surely gravity would still keep the air down? I'm struggling to see what effect the pipe would have?
Xen Gin The Dragoons	Posted - 2008.02.08 16:36:00 - [4] Edited by: Xen Gin on 08/02/2008 16:36:09 Originally by: TheWench Originally by: lofty29 Yes. In theory Surely gravity would still keep the air down? I'm struggling to see what effect the pipe would have? Its wouldn't last long! Since the moon's asynchronous and isn't an exactly perfect circular orbit.
Tarminic Forsaken Resistance The Last Stand	Posted - 2008.02.08 16:37:00 - [5] No, because Earth's gravity would keep the air there. ---------------- Tarminic - 31 Million SP in Forum Warfare Play EVE: Downtime Madness v0.78.2
Daelorn State War Academy	Posted - 2008.02.08 16:39:00 - [6] The suckage that is space would not defeat gravity?
Tarminic Forsaken Resistance The Last Stand	Posted - 2008.02.08 16:42:00 - [7] Originally by: Daelorn The suckage that is space would not defeat gravity? If it does, how are we breathing? ---------------- Tarminic - 31 Million SP in Forum Warfare Play EVE: Downtime Madness v0.78.2
Asharee Intrefer	Posted - 2008.02.08 16:43:00 - [8] Originally by: Daelorn The suckage that is space would not defeat gravity? Space is not suckage. When something decompresses in space it's the inside pressure that forces the air out into space.
Maltitol Gallente Tides of Silence Hydra Alliance	Posted - 2008.02.08 16:49:00 - [9] negative pressure in the pipe it would suck air out from earth Originally by: CCP Wrangler Well boohoo
Avery Fatwallet	Posted - 2008.02.08 16:54:00 - [10] now thats a good one i think :) we got negative pressure in hte pipe, at least on the moon end, and pressure on the earth end. but still thats happening on the top of our atmosphere... so actually that pipe probably shouldnt have an effect. and now dont give me that capillaric effect or however your spell that in english :) yup.. thinking about it: rotation, pressure and gravity balance each other out, and the pipe will have air in it, about the same height as our atmosphere, im not sure about this. but this is what sounds most logical to me.
Tarminic Forsaken Resistance The Last Stand	Posted - 2008.02.08 16:56:00 - [11] any force generated by the low pressure in the pipe will be balanced by the force generated by gravity and friction. Otherwise all the air on Earth would just fly off into space, no? ---------------- Tarminic - 31 Million SP in Forum Warfare Play EVE: Downtime Madness v0.78.2
Avery Fatwallet	Posted - 2008.02.08 17:06:00 - [12] Originally by: Tarminic any force generated by the low pressure in the pipe will be balanced by the force generated by gravity and friction. Otherwise all the air on Earth would just fly off into space, no? yeah thats what i meant, basically.
Sqalevon The Ragnarg Brotherhood	Posted - 2008.02.08 17:13:00 - [13] Originally by: Maltitol negative pressure in the pipe it would suck air out from earth Negative preasure doesn't exist. But I think you mean a preasure lower then the earth's at ground level. In wich case gravity would have the same effect in the pipe as it would outside the pipe.
Imperator Jora'h	Posted - 2008.02.08 22:29:00 - [14] Nothing would happen (not counting the issues of having a pipe attached to the moon dragging itself around the earth). The air would stay right where it is. Think about it...there is nothing "sealing" air from space now and it stays. This is due to gravity. If you prefer a simpler example stick a hose down into about 33 feet of water (33 feet = 1 atmosphere of pressure) with the other end sticking out into the air. The pressure at the bottom is much more than above the surface. No water will come out. Do it with a glass and a straw or stick a pipe down 15,000 feet into the water...same thing...nothing will happen.
Aaron Ravenwood	Posted - 2008.02.08 23:09:00 - [15] Edited by: Aaron Ravenwood on 08/02/2008 23:16:54 Yeah. Lets assume that each end of the pipe was supported by anti gravity devices so that it isn't dragging along the ground as well as having a propulsion device capable of keeping it in aligned with both the earth and moon as the moon orbits the earth. So, the moon, the earth and the pipe would all be moving but the pipe would maintain some specific distance from the surface of both bodies. Say both ends of the pipe were sealed in the beginning. 1) If the inside was a vacuum to start, when the ends were opened the pipe would suck air into it until the air in the pipe reached the same level as the air outside the pipe. 2) If the inside was under pressure, i.e. it had air in it, the air inside would whoosh out at the moon end of the pipe until it got down to the level of the air on the earth. If both ends stayed open throughout it's construction, then nothing would happen. The pipe would have air in it up to the limits of the atmosphere and after that ... no air. . . .
Roxanna Kell FinFleet Band of Brothers	Posted - 2008.02.09 00:10:00 - [16] It will depend on the diameter of the tube. and what altitude is it from moon and earth, especially earth. If the tube is just arpudn the entrance into the ozone, i wouldn't worry about it since there is hardly any air, if it is 2 meters fromt he ground, It wouldnt get sucked out, not all of it. just a little 1%. the proof? Linkage
Glassback Body Count Inc. Mercenary Coalition	Posted - 2008.02.09 00:15:00 - [17] What if we had a portal gun? ;) G. BH Kharnubis > Need more people against the MC meanies
Sister Impotentata Elite Angels Of Death	Posted - 2008.02.09 00:24:00 - [18] We need to know where exactly the endpoints of the pipe are. I think. Thinks more. No, we don't. It doesn't matter. If the earthside end of the pipe is at sea level and STP (or anywhere else, actually), nothing will come out of the moon end of the pipe. The pipe is irrelevant to this problem. If the moon could pull atmosphere from the earth in any quantity, it would. But it doesn't. Putting a pipe in the system wouldn't change anything. ----- TANSTAAFL Originally by: Tommy I've go' the Scourges son. I thin' it's you wha' sh' b'ave. Wha'? You wa' aa' see 'f I go' tha' minerals?
F'nog Amarr Celestial Horizon Corp. Valainaloce	Posted - 2008.02.09 00:41:00 - [19] I'll put it in simple terms. You have "negative" pressure on the Moon. You have "positive" pressure on the Earth. Net pressure is 0. Nothing changes. Originally by: Kazuma Saruwatari F'nog for Amarr Emperor. Nuff said
Shameless Avenger	Posted - 2008.02.09 02:21:00 - [20] I think you should also take into account the diameter of the pipe. I can't remember the name of the force that acts here but, remember when the nurse collected blood from your finger with a small tube and the blood went up the tube like magic?
Asharee Intrefer	Posted - 2008.02.09 03:15:00 - [21] Originally by: Shameless Avenger I think you should also take into account the diameter of the pipe. I can't remember the name of the force that acts here but, remember when the nurse collected blood from your finger with a small tube and the blood went up the tube like magic? Those tubes are called Vacutainers and, as the name implies, use a pressure imbalance to draw blood as the cap of the container is punctured when it is attached to the holder on the needle.
Shameless Avenger	Posted - 2008.02.09 03:58:00 - [22] I think it was something different... not sure. The ones I remember were open on both ends, made out of glass and with a very tiny diameter. I think it sucked the blood due to the liquid's adhesion or something like it. I just don't remember the name correctly therefore I can't google it properly. It has to do with the fact that when you stick your finger in water, the water near the finger rises a litte bit. That's all I remember.
Imperator Jora'h	Posted - 2008.02.09 06:13:00 - [23] Originally by: Shameless Avenger Edited by: Shameless Avenger on 09/02/2008 04:09:44 I think it was something different... not sure. The ones I remember were open on both ends, made out of glass and with a very tiny diameter. I think it sucked the blood due to the liquid's adhesion or something like it. I just don't remember the name correctly therefore I can't google it properly. It has to do with the fact that when you stick your finger in water, the water near the finger rises a litte bit. That's all I remember. I think you are thinking of capillary action and you are correct that the diameter of the tube has an effect on this. A very narrow tube will indeed draw water up a bit above the surrounding surface. A wide tube the effect is barely noticeable (if you look at a glass of water closely you can see the water at the edge is ever so slightly higher than the rest of the water). This is caused by surface tension of the water. Surface tension is different for different liquids (ever spill rubbing alcohol on the counter...it spreads out where water would leave little puddles). Indeed some liquids show a reverse effect to water and actually climb downward at the edges. However, a gas is not a liquid and air is a gas here on earth. It does not have a surface tension so it will not climb up the edges of even a really thin tube. Even water will not climb very high at all (while noticeable the effect is quite small)...eventually gravity asserts itself. Note none of the above has to do with pressure so the moon question changes nothing.
Woodwraith Prophets Of a Damned Universe	Posted - 2008.02.09 06:37:00 - [24] The thing to be pointed out here, is that there isnt negative pressure to draw the air out of the pipe, theres the same near zero pressure as everywhere else in space, the gravity that keeps the atmosphere on the planet will still keep it there, pipe or not

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