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Counting States / Uncertainty principle

  1. Oct 1, 2005 #1
    I have a question about an example in my physics notes. It considers Nitrogen at room temperature and calculates p*r and finds this to be greater than h-bar and so it is consistent with the uncertainty principle:
    p*r = 2.4*10^-26 > hbar = 1*10^-27

    It says at room temperature the momentum can be specified to a reasonable fraction of the typical momentum and the position to about a molecular size and still be consistent with qm and the uncertainty principle. what does this mean?

    The mass they used was 28*mass of a proton, but what about the neutrons (or is it okay just for an estimation to use only the neutrons?) I thought that it was deltap and deltar in the uncertainty principle equation, not p or r.
  2. jcsd
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