What causes the sound when a hot wire gauze cools in a glass tube?

Subject: What causes the sound when a hot wire gauze cools in a glass tube?

Date: Mon Oct 1 13:53:27 2001
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Area of science: Physics
ID: 1001958807.Ph

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Take a 1 metre length of 5cm glass tubing and insert a piece of wire gauze 
about 15cm from one end. Hold the tube vertically over a bunsen flame so that 
the gauze glows red hot. Take the tube away from the bunsen and as the gauze 
cools a musical note is produced. What causes this vibration? Is it something 
to do with cool air eddies entering the bottom of the tube?

Re: What causes the sound when a hot wire gauze cools in a glass tube?

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