Why does a freshly opened bottle of beer foam over when struck on top?

Subject: Why does a freshly opened bottle of beer foam over when struck on top?

Date: Wed Nov 30 19:03:46 2005
Posted by Buddy
Grade level: grad (science) School: University of Florida
City: Gainesville State/Province: FL Country: USA
Area of science: Chemistry
ID: 1133402626.Ch

Message:


This is an "old" party gag.  With a freshly opened bottle, strike the top with a
downward motion from another bottle (usually) and the freshly opened beer will
foam over almost entirely.  Why?

Re: Why does a freshly opened bottle of beer foam over when struck on top?

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