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Does a medium have to have mass to 'be' a medium?

  1. Jan 31, 2012 #1
    For example can massless particles serve as media?
  2. jcsd
  3. Jan 31, 2012 #2
    Don't we call that vacuum?
  4. Jan 31, 2012 #3
    Ahh but the all encompassing aether is massless. :wink:
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