Timeline for Volume of ideal gas molecule [closed]
Current License: CC BY-SA 4.0
16 events
| when toggle format | what | by | license | comment | |
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| Feb 5, 2021 at 17:57 | review | Reopen votes | |||
| Feb 5, 2021 at 19:10 | |||||
| Feb 5, 2021 at 15:10 | vote | accept | PV. | ||
| Jan 29, 2021 at 13:24 | history | closed |
Mithoron Mathew Mahindaratne DrMoishe Pippik Jon Custer Todd Minehardt |
Needs details or clarity | |
| Jan 27, 2021 at 19:22 | comment | added | Ed V | @MaxW Thanks, I stand corrected! ;-) Glad I never went beyond van der Waals when I taught general chemistry! | |
| Jan 27, 2021 at 19:18 | comment | added | MaxW | @EdV - Better than the equation of state link is the link to the Wikipedia article for real gas. | |
| Jan 27, 2021 at 10:15 | comment | added | Alchimista | Not really what you ask but note that this, while being an approximation, points to the a very basic fact. A P "component" unrelated to force and occupancy of space but intrinsic to the existence of particles. | |
| Jan 26, 2021 at 22:21 | answer | added | matt_black | timeline score: 3 | |
| Jan 26, 2021 at 18:34 | comment | added | Ed V | Saving the best for last [ ;-) ], see equation of state in wikipedia! Loads of increasingly complicated equations of state! Imagine being a beginning chemistry student and having all that dropped on you! Hence the practical reality that beginning chemistry courses are heavily simplified (and often seriously over-simplified) so as to be manageable and so that there are survivors! | |
| Jan 26, 2021 at 17:59 | comment | added | MaxW | I'd use voluminous instead of cumbersome, but Maurice makes a good point. Chemistry typically uses 3 or 4 significant figures at best. The equation PV=nRT isn't going to yield 15 digits of precision. // Van der Waals equation makes some rudimentary corrections to the ideal gas equation. | |
| Jan 26, 2021 at 17:28 | comment | added | Maurice | The experiment shows that boiling water at 100°C produces a vapor which is about $1000$ times more cumbersome that the liquid water from which it is produced. As in this process the molecules have not been chemically modified, it means that in the vapor, the volume occupied by the molecules is negligible, as if they were point particles. | |
| Jan 26, 2021 at 17:28 | comment | added | Karsten♦ | If it weren't negligible, we would expect different behavior of molecules of distinct size. However, the ideal gas law is not dependent on particle size. You might try to derive a gas law for uniform volume particles rather than zero-volume particles but then you would expect that chosen uniform volume to somehow appear in your alternative gas law (for example, the volume of the gas could not be smaller than the total volume of particles). In the ideal gas law, the volume of the gas approaches zero as the temperature approaches zero (with fixed n and p). | |
| Jan 26, 2021 at 17:25 | review | Close votes | |||
| Jan 29, 2021 at 13:24 | |||||
| Jan 26, 2021 at 17:02 | comment | added | Ed V | If you assume point particles and no inter-particle forces, as simplifying approximations, then you have an easy path to this useful approximation: pV = nRT, i.e., the ideal gas law. Of course, you can assume non-negligible particle sizes and assume that inter-particle forces exist, so then the equation of state will necessarily be more complicated. | |
| Jan 26, 2021 at 16:56 | history | edited | PV. |
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| Jan 26, 2021 at 16:53 | review | First posts | |||
| Jan 26, 2021 at 17:23 | |||||
| Jan 26, 2021 at 16:50 | history | asked | PV. | CC BY-SA 4.0 |