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Mass-energy equivalence where's the arbitrary constant?

  1. Oct 31, 2008 #1
    I'm curious about the famous formula, [tex]e=mc^2[/tex] . Since mass can be measured in any of several unit systems, shouldn't the formula read [tex]e\propto mc^2[/tex] ?

    Thanks!
     
    Last edited: Oct 31, 2008
  2. jcsd
  3. Oct 31, 2008 #2

    russ_watters

    User Avatar

    Staff: Mentor

    No, you just need to keep the units consistent throughout the equation.
     
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