Timeline for How can fast moving particles gain energy from slow moving ones?
Current License: CC BY-SA 3.0
14 events
| when toggle format | what | by | license | comment | |
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| Sep 14, 2015 at 15:01 | comment | added | CuriousOne | @Floris: But blowing things into low earth orbit... is. :-) | |
| Sep 14, 2015 at 14:59 | comment | added | Floris | Blowing things up - it's not rocket science! | |
| Sep 14, 2015 at 14:14 | history | edited | CuriousOne | CC BY-SA 3.0 |
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| Sep 14, 2015 at 14:07 | comment | added | CuriousOne | @Aaron: You are absolutely correct. With just the right nozzle shape one can avoid all the problems and achieve a near perfect supersonic flow. If I am not mistaken the rocket scientists must have blown up thousands of chambers and nozzles to figure out what that right shape is. :-) | |
| Sep 14, 2015 at 13:08 | comment | added | Aron | Important caveat. Assuming Isothermal Compression. We can do some interesting things with a CD nozzle with steam (like in a LOX Liquid Hydrogen rocket). | |
| Sep 13, 2015 at 22:15 | comment | added | Floris | @CuriousOne - thanks for the vote of confidence. I did a little bit of wordsmithing to address my own misreading. If I misunderstood, so might someone else. Hope this is better now. | |
| Sep 13, 2015 at 22:14 | history | edited | Floris | CC BY-SA 3.0 |
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| Sep 13, 2015 at 22:07 | history | edited | CuriousOne | CC BY-SA 3.0 |
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| Sep 13, 2015 at 22:06 | comment | added | CuriousOne | @Floris: Feel free to edit the answer, you know I trust you. As you know it started out as a comment and it could use some polishing, for sure. | |
| Sep 13, 2015 at 21:53 | comment | added | Floris | Sorry I misread... My up vote stands... | |
| Sep 13, 2015 at 21:48 | comment | added | CuriousOne | @Floris: I didn't say that the propagation was limited to the speed of individual molecules. It's not. The speed of sound in water is about three times higher. Once you leave this thermodynamic regime, though, things go crazy and shock waves are not fun stuff... | |
| Sep 13, 2015 at 21:42 | comment | added | Floris | Actually pressure can propagate faster than the speed of the molecules - because molecules have finite size and are close together, if you put three of them in a row and move the one on the left, the one on the right will feel the motion very quickly - with a time determined by the slope of the potential curve and the mass of the molecule, not the mean speed of the molecules. | |
| Sep 13, 2015 at 19:07 | comment | added | Level River St | +1 This is the right answer. There is a hard limit on how fast you can make that jet of water, which is closely related to the speed of sound, which in turn is closely related to the speed at which the molecules are randomly moving. | |
| Sep 13, 2015 at 17:56 | history | answered | CuriousOne | CC BY-SA 3.0 |