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Formula help

  1. Dec 13, 2011 #1
    does anyone know the formula for matter mass density i know for photon density is row=8.36*10^-33 * T^4
     
  2. jcsd
  3. Dec 13, 2011 #2
    What sort of mass? Without context usual mass density is simply the mass you have over the volume it occupies.
     
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