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From: tino@hou2f.UUCP (A.TINO)
Newsgroups: net.news
Subject: RE: does the hole expand when heated?
Message-ID: <556@hou2f.UUCP>
Date: Tue, 29-Oct-85 10:53:36 EST
Article-I.D.: hou2f.556
Posted: Tue Oct 29 10:53:36 1985
Date-Received: Wed, 30-Oct-85 06:45:52 EST
Distribution: net.puzzle
Lines: 41

>Concerning the problem:
Organization: AT&T Bell Labs, Holmdel NJ
Lines: 38

> 
>Does the hole expand when the metal around the hole is heated?
> 
>Try it for yourself!  Here's how...
> 
>[This experiment is given in the 7th grade General Science book published
>by D.C. Heath, 1961.  I used it many times in my former junior high science
>teaching days to prove that metal expands when heated.]
> 
>You need 2 pieces of apparatus:
> 
	>1) loop of 1/4" thick metal, attached to a wooden handle so it can
	   >be held in a flame without burning yourself.
> 
	>2) ball that just fits through the metal loop, attached to a wooden
	   >handle so you can hold it easily.
> 
>Procedure:  Holding the loop by its handle, place the metal end in a flame
	>for a minute or so (We used a gas burner, but even a fireplace will 
	>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 !

________________________________________

That would be AMAZING if it were true. I just don't believe it!!!!!

I would believe the following demo: make the ball just a little
too big to fit through the metal ring when the ring is at room
temperature. Now if you heat the ring, it expands --THE HOLE GETS
BIGGER!!! When the ring is hot the ball passes through it easily.

Al Tino