Hot chocolate phenomenon

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From: Matthew Micari (micari@sbcglobal.net)
Date: Mon Sep 13 2004 - 18:49:52 PDT 

Message-ID: <20040914014952.2147.qmail@web81203.mail.yahoo.com>
Date: Mon, 13 Sep 2004 18:49:52 -0700 (PDT)
From: Matthew Micari <micari@sbcglobal.net>
Subject: Hot chocolate phenomenon

Hey, a friend asked me this question and I have NO
idea.
While stirring a cup of hot chocolate (swiss miss
instant in hot water) with a metall spoon, you will
hear the sounds of the spoon claning against the mug.
If you you tap the bottom of the mug the pitch of the
clanking will increase. What causes this increase in
pitch?

We tried this with tea and there was no pitch
increase.

hmmmm.

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