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Article #4082Re: Do Balloons fly?
From: John C. Baez
Date: Fri, 06 Nov 1992 03:16
Date: Fri, 06 Nov 1992 03:16
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In article <1dbs8vINNau0@agate.berkeley.edu> aephraim@physics.Berkeley.EDU (Aephraim M. Steinberg) writes: >In article <1992Nov5.130316.28438@kth.se> e92_anh@vaxkab.lne.kth.se () writes: >>This will probably sound like a silly question to a lot of you, but WHY >>does a helium-filled balloon rise upward? Is it because of the >>difference in air-pressure at the balloon's top and bottom, causing the >>resulting force to press it upward? >Yes, amazingly enough. And now for the natural next question - so, does that mean that a lead-filled balloon falls because the difference in air pressure is reversed in that case? :-)
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Newsgroups: sci.physics Path: arc1-ca.pugleaf.net!sparky!uunet!snorkelwacker.mit.edu!galois!riesz!jbaez From: jbaez@riesz.mit.edu (John C. Baez) Subject: Re: Do Balloons fly? Message-ID: <1992Nov6.031615.7269@galois.mit.edu> Sender: news@galois.mit.edu Nntp-Posting-Host: riesz Organization: MIT Department of Mathematics, Cambridge, MA References: <1992Nov3.175155.27867@impmh.uucp> <1992Nov5.130316.28438@kth.se> <1dbs8vINNau0@agate.berkeley.edu> Date: Fri, 6 Nov 92 03:16:15 GMT Lines: 16