home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!olivea!decwrl!sdd.hp.com!usc!rpi!batcomputer!munnari.oz.au!newsroom.utas.edu.au!bruny.cc.utas.edu.au!u894793
- From: u894793@bruny.cc.utas.edu.au (Timothy D Little)
- Newsgroups: sci.physics
- Subject: Re: The Bubbles
- Message-ID: <u894793.712465819@bruny>
- Date: 30 Jul 92 03:10:19 GMT
- References: <1992Jul28.105101.16100%clwu@Uz.nthu.edu.tw>
- Sender: news@newsroom.utas.edu.au
- Organization: University of Tasmania, Australia.
- Lines: 41
-
- clwu@Uz.nthu.edu.tw (Ching-Long Wu (PHYS U790315)) writes:
-
- >Hello everyone!
- > I am quite interested in the behavior of the bubbles that floating
- >on water's surface. I have several questions:
-
- >1. What's the shape of it? Is it a perfect semi-sphere?
-
- It can't be a perfect semi-sphere due to the effect of surface tension at
- the edges. Furthermore, the internal pressure of the bubble would make
- the 'flat' bottom slightly curved.
-
- >2. Why does it break? And what's the machanism of it's breaking?
-
- I read once that it was evaporation of the bubble film. I don't know
- how much weight to give this, since it was a 'popular science' book and
- not a technical one.
-
- >3. I suppose there are some relation between a bubble's 'life' and 'size'.
- > I think of an experiment like this:
- > [details deleted]
- > When a bubble appears on the surface, mesure its diameter immediately and
- >start the time counting till it breaks. Has any one done such kind of
- >experiment? What's it look like?
-
- I haven't read of any such experiment. The results should be derivable,
- but confirmation would be good.
-
- >4. What if the bubbles are floating in the air? If there is no gravitation,
- >will them break?
-
- If the mechanism for breakage is evaporation, then yes they would.
-
- > I hope you are also interested in these questions...
-
- Fairly much. I'm more interested in the 'antibubbles' you get by skimming
- small droplets of water across the surface, consisting of a glob of water
- separated from the main mass by a thin film of air (I assume).
- --
- Timothy D Little a.k.a. u894793@bruny.cc.utas.edu.au
- "I'm a Tasmanian." - Yahoo Serious, in the film Young Einstein.
-