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Uncertainity regarding measurement

  1. Mar 29, 2013 #1

    I was viewing a lecture of one of the professor's most possibly in MIT who demonstrated in the class room, by calling a boy and measuring him, while standing, a certain measurement say 5 ft. After that he asked the boy to lie down and again measured him and found that there is a difference, say +- some amount. He concluded that there is always a uncertainty in measurement while standing and the same person lying down.

    Can anybody please explain me the reason? Why?

  2. jcsd
  3. Mar 30, 2013 #2


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    What changes occur to the boy standing versus laying down?
  4. Mar 30, 2013 #3
    Nothing physically. The measurement rod shows the difference. Can you tell me the reason please?
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