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From: majka@anchor.cs.ubc.ca (Marc Majka)
Newsgroups: sci.misc
Subject: Re: Soap Bubbles
Message-ID: <1958@ubc-cs.UUCP>
Date: 8 Apr 88 16:48:22 GMT
References: <631@amc.UUCP>
Sender: nobody@ubc-cs.UUCP
Reply-To: majka@anchor.cs.ubc.ca (Marc Majka)
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Organization: UBC Department of Computer Science, Vancouver, B.C., Canada
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In article <631@amc.UUCP> warren@amc.UUCP (Warren Omohundro) writes:
> Washing the jugs consists of putting a small amount of detergent water into
> the jug, covering the mouth of the jug with a hand, and shaking vigorously.
> When you uncover the mouth of the jug, there is a noticable release in
> pressure.  My question: Where does the extra air pressure come from? 

How about heat?  When you begin, there is hot water and cool air in the jug.
After shaking it around for a bit, the air will have heated and expanded.  
This is just my guess.  Try a couple of experiments:

1: Use cold soapy water.
2: Use hot water and no soap.

---
Marc Majka