The acceleration of a bubble in water

  • #1
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Hi,

I have a question about a rising bubble.
I read that the initial acceleration of a bubble (with negligible mass) in water is 2g, where g is the gravitational acceleration. I understand that if a bubble rise then the water move around it, but I can't derive this equation.
Could someone help me out?
 

Answers and Replies

  • #2
BvU
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I see no reasonable argument for this statement.
What is your reference and what does it say to justify such a claim ?
 
  • #3
ZapperZ
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I read that .......

This requires a clear reference to the source.

Zz.
 
  • #5
hilbert2
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Looking at the pdf file, the problem 52 seems to assume that the liquid has no viscosity, which isn't true in general.
 
  • #6
BvU
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I did find a 2g here but don't see an explanation. And here it gets worse: 3.3 g ! But they do show how the 2g comes about in section 2 (of course :smile:). So your derivation is available.

Must admit I learned to be a bit more open-minded: at first I didn't believe more than g is physically possible....

This one below ? I don't see it. But then again: you say the answer is 2. So: follow the steps and see where you end up
Help us help you and post your working ...

upload_2018-6-26_17-57-58.png
 

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  • #7
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Thanks, I'm not certain that I can understand your reference because that seems very complicated but I'll try
 

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