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Path: utzoo!watmath!clyde!cbosgd!ihnp4!nsc!decwrl!daemon
From: daemon@decwrl.UUCP (The devil himself)
Newsgroups: net.puzzle
Subject: Re:  Does the hole expand when heated?
Message-ID: <1114@decwrl.UUCP>
Date: Mon, 28-Oct-85 13:29:05 EST
Article-I.D.: decwrl.1114
Posted: Mon Oct 28 13:29:05 1985
Date-Received: Wed, 30-Oct-85 04:55:16 EST
Organization: Digital Equipment Corporation
Lines: 30



 
Concerning the problem:
 
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 !