Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site ecsvax.UUCP Path: utzoo!watmath!clyde!bonnie!akgua!mcnc!ecsvax!hes 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