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Missing Mass

  1. Mar 15, 2006 #1
    I've calculates the density of aluminium using the debye theory.
    I found The atom density n = 2.24E28 m^-3 at 600k (assumed to be the same as at room temperature).
    Therefore the density is just the molecular mass m (m(grams) = (79amu / Avogadros number), multiplied by the atom density. Which I found to be 1000 kg m^-3.
    I'm asked to compared to this with a true value of 2700 Kg m^-3.

    My estimate just assumes all the mass is the atoms, but I'm not sure why the discrepancy is so large. I thought the majority of the mass of a solid was in the atoms.
  2. jcsd
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