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Shouldn't the mass of an electron be uncertain?

  1. May 26, 2013 #1
    How is the mass of an electron known down to 31 orders of magnitude? Shouldn't the mass be uncertain beyond a few decimal places?
     
  2. jcsd
  3. May 26, 2013 #2

    dextercioby

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    It is, the [itex] 10^{-31}[/itex] is certain, the 9 something number at the front isn't.
     
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