Timeline for Why do bubbles make a sound?
Current License: CC BY-SA 3.0
13 events
| when toggle format | what | by | license | comment | |
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| Jul 22, 2014 at 18:29 | comment | added | David Zwicker | Alright, this discussion got a little bit out of hands, so I decided to post a Q&A on why the pressure inside a bubble is larger than outside: physics.stackexchange.com/q/127695/45640 | |
| Jul 22, 2014 at 16:28 | comment | added | Chris | @Cruncher: That would depend on how the bubble was formed. In the case of soap bubbles created by blowing on a film then in woolly terms the blowing is applying a force that is compressing the air (a bit) while causing the film to buckle out. When it snaps into a bubble then the compressed air remains in the bubble, thus higher pressure. Use a balloon as an analogy and it might be more obvious in some ways (as long as you accept the analogy). | |
| Jul 22, 2014 at 15:57 | comment | added | Cruncher | @Chris I was going to say this. But I was thinking. We know the pressure inside has to be higher, by the nature of the bubble. Is there any indication of how it got higher though? | |
| Jul 22, 2014 at 15:30 | vote | accept | Thoth19 | ||
| Jul 22, 2014 at 15:30 | vote | accept | Thoth19 | ||
| Jul 22, 2014 at 15:30 | |||||
| Jul 22, 2014 at 12:33 | comment | added | Chris | The way I think of it from an intuition point of view is that bubbles want to be small, the surface tension is pulling all the parts together. This means that at that surface there is the outside air pressure pushing in, the inside air pressure pushing out and the surface tension pushing in. Thus the air pressure must be greater inside to balance that surface tension. | |
| Jul 22, 2014 at 4:39 | comment | added | Thoth19 | Is it because cohesion forces are relatively more powerful on smaller scales, so only small bubbles can withstand the pressure gradient, but in larger ones they would immediately pop? | |
| Jul 22, 2014 at 4:34 | comment | added | Thoth19 | Is there an intuition I can gain for why the pressure is greater on the inside? I'd assume the very fact that it is contained by the bubble itself right? Off to look up a pressure wave. Thank you. | |
| Jul 22, 2014 at 3:22 | comment | added | David Zwicker | I added a link to Wikipedia, which explains Laplace pressure much better than I ever could. | |
| Jul 22, 2014 at 3:21 | history | edited | David Zwicker | CC BY-SA 3.0 |
added link
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| Jul 22, 2014 at 2:52 | comment | added | ACuriousMind♦ | Hi David Zwicker, and welcome to Physics.SE! We usually like our answers to be a bit more self-contained, or at least link to some useful resources. I believe your answer might even be right, but it's bery hard for me to judge that from what you've written. For example, why is the pressure inside the bubble different? | |
| Jul 22, 2014 at 2:28 | review | First posts | |||
| Jul 22, 2014 at 2:52 | |||||
| Jul 22, 2014 at 2:25 | history | answered | David Zwicker | CC BY-SA 3.0 |