Why would a metal ball not return to its original volume?

Subject: Why would a metal ball not return to its original volume?

Date: Mon Oct 23 09:29:32 2006
Posted by James
Grade level: teacher/prof School: Brigantine North Middle
City: Brigantine State/Province: NJ Country: 08203
Area of science: Physics
ID: 1161620972.Ph

Message:


I am an 8th grade science teacher.  When teaching thermal expansion I use the 
ball and ring experiment.  After heating the ball for 5 classes the demo stopped 
working.  The ball remained too large to fit through the ring after it was 
cooled.  I use tap water to cool the ball.

Why would it not return to its original volume after being heated then cooled?

Re: Why would a metal ball not return to its original volume?

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