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From: hes@ecsvax.UUCP (Henry Schaffer)
Newsgroups: net.puzzle
Subject: Re:  Does the hole expand when heated?
Message-ID: <651@ecsvax.UUCP>
Date: Tue, 29-Oct-85 11:12:58 EST
Article-I.D.: ecsvax.651
Posted: Tue Oct 29 11:12:58 1985
Date-Received: Sat, 2-Nov-85 00:12:08 EST
References: <1114@decwrl.UUCP>
Organization: NC State Univ.
Lines: 19

> Does the hole expand when the metal around the hole is heated?
>  
> Try it for yourself!  Here's how...
>  
> You need 2 pieces of apparatus:
> 	1) loop of 1/4" thick metal, attached to a wooden handle so it can
> 	2) ball that just fits through the metal loop, attached to a wooden
>  
> Procedure:  Holding the loop by its handle, place the metal end in a flame
> 	do).  Then try to fit the ball apparatus through the loop.  You
> 	will find that the heated metal has expanded in all directions 
> 	(including inward into the space of the hole), making the hole smaller
>  	so that the ball no longer fits through the loop.  Once the loop cools 
> 	off, the ball will once again be able to fit through.
>  
> A M A Z I N G !
I think I remember this experiment - except that the ball was heated, and then
couldn't go through the hole.
--henry schaffer