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Increase in length directly proportional to the origin length

  1. Jun 13, 2013 #1
    Hi all,

    When an object is heated , why is the amount of change in its length directly proportional to the original length ? I have read that the increase in length it is directly proportional to the initial length in most of the articles. But I wanted to know how this proportionality arrived at ??
     
  2. jcsd
  3. Jun 13, 2013 #2

    jbriggs444

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    Science Advisor

    If one meter stick expands by 1 mm when heated by some amount then two hot meter sticks laid end to end will longer by a total of 2 mm.

    And each half of a hot meter stick will have expanded by 1/2 mm.
     
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