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Homework Help: Propertes of material

  1. Jan 29, 2010 #1
    if i have a metal sheet and i cut a hole in its center, and heat the sheet, will the hole grow larger or smaller?? (knowing that the material has a positive therml expansion)?

    i know that the metal wants to expand, but in which direction,
    i would think it would grow smaller but thats just intuition. can someone please explain this to me
  2. jcsd
  3. Jan 29, 2010 #2


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    It will get larger as the expansion is uniform and to the outside. Think of it as a ring with a ring around it and so on to about 100 rings. if you heat them up they will all expand and grow in size and their connections ( the surface where 2 of them touch) will not be broken.
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