Timeline for Is Wikipedia's definition of an ideal gas correct?
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
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| Oct 16, 2022 at 20:41 | comment | added | user291161 | A strongly idealized gas (point particles) explains the pressure on the walls but does not seem to explain the effect of the question (in reality I am not completely sure but the problem becomes unrealistic and uninteresting) but an ideal but less ideal gas (rigid spheres that collide elastically) explains it. It all depends on what exactly we mean by ideal gas. | |
| Oct 15, 2022 at 22:01 | comment | added | Filip Milovanović | You can't look at a real experiment, see the outcome, and decide that that's what two containers of ideal gas will do under the same circumstances - that's fudging the model. You have to compute (predict) what the two ideal gases will do given the assumptions of the model, then compare with what actually happens in experiment. If it agrees, fine! If it doesn't - great - you just found an area where the model doesn't apply, at least not without modification (and are thus helping map out its domain of applicability) 2/2 | |
| Oct 15, 2022 at 22:01 | comment | added | Filip Milovanović | "But suppose that two boxes of ideal gas at different temperatures are placed side by side and the separator septum is removed. In the end we will find a gas at an intermediate temperature so the molecules interacted" - you're looking at this backwards. Ideal gas is a model (an abstract description of a real phenomenon that only focuses on certain aspects, and ignores others: that is, it's an idealized thing). You can't place to boxes of "ideal gas" side by side. You can place two boxes of real gas side by side, and a real gas has more complexity. 1/2 | |
| Oct 15, 2022 at 12:35 | comment | added | Poutnik | Speed of sound, diffusion and other phenomena directly involving molecular interaction could bring problems for the ideal gas model. | |
| Oct 15, 2022 at 12:20 | answer | added | wzkchem5 | timeline score: 1 | |
| Oct 15, 2022 at 5:34 | comment | added | FlatterMann | Most "ideal" physical systems have such degeneracies and most non-ideal ones can not be calculated at all. The ideal gas does, indeed, not satisfy the requirements of statistical mechanics because it is not ergodic. It is still a very useful approximation in many cases. A better definition might be something like "An ideal gas is the approximation of the behavior of a real gas in which interparticle interactions can be neglected for the purpose of the problem.". Yes, physics is sometimes like lawyering. | |
| S Oct 15, 2022 at 5:22 | history | suggested | Bergi | CC BY-SA 4.0 |
Better title
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| Oct 15, 2022 at 4:09 | review | Suggested edits | |||
| S Oct 15, 2022 at 5:22 | |||||
| Oct 15, 2022 at 1:41 | history | became hot network question | |||
| Oct 14, 2022 at 21:00 | history | tweeted | twitter.com/StackPhysics/status/1581027071320788993 | ||
| Oct 14, 2022 at 18:19 | history | edited | Qmechanic♦ | CC BY-SA 4.0 |
added 53 characters in body; edited tags
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| Oct 14, 2022 at 18:03 | comment | added | Quillo | You are completely right, if there is no interaction, then there can not be thermal equilibrium (in fact, in plasma physics 2 different species often take so long to reach full thermodynamic equilibrium, that they can be modelled with two different temperatures). More precisely: physics.stackexchange.com/a/460468/226902 and physics.stackexchange.com/a/375611/226902 (in this respect, your example of two gases mixing is not very different from the plasma case). | |
| Oct 14, 2022 at 18:02 | answer | added | user291161 | timeline score: 17 | |
| Oct 14, 2022 at 17:39 | history | asked | user291161 | CC BY-SA 4.0 |