1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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] ?

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


    User Avatar

    Staff: Mentor

    No, you just need to keep the units consistent throughout the equation.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook