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Counter-Intuitive Science

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Author Topic:   Counter-Intuitive Science
nwr
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From: Geneva, Illinois
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Message 64 of 182 (600155)
01-12-2011 9:47 PM 		Reply to: Message 60 by jar
01-12-2011 8:47 PM

Re: Balloons & Bubbles
Is the pressure inside a bubble greater than outside the bubble?
Yes, though perhaps only very slightly greater. That difference is what holds the film (surface of the bubble) taut.
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Jesus was a liberal hippie
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nwr
Member
Posts: 6412
From: Geneva, Illinois
Joined: 08-08-2005
Member Rating: 4.5

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Message 71 of 182 (600163)
01-12-2011 10:59 PM 		Reply to: Message 65 by jar
01-12-2011 9:49 PM

Re: Balloons & Bubbles
If the pressure was greater at one point than at another what shape should be seen?
The shape does not depend on absolute pressure, but on the difference of pressure between inside air and outside air. For an approximately spherical bubble, that difference needs to be constant. The absolute pressure is lower at the top of the bubble than at the bottom, though the difference is probably too small to measure.
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Jesus was a liberal hippie
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