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Homework Help: Amu vs u Atomic Mass Units

  1. Feb 8, 2016 #1
    1. The problem statement, all variables and given/known data
    What is the difference between amu and u?
    In my book they seem to use u but on my online homework it uses u and it seems to be the same thing.

    2. Relevant equations
    chemistry has too many special units

    3. The attempt at a solution
    atomic mass unit 1/12 mass of an atom of carbon 12
    u unified atomic mass unit 1 g/mol
    I still don't understand whats the importance of the two like what equations do you use over the other.
  2. jcsd
  3. Feb 8, 2016 #2


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    One and the same thing. Also known (but not widely :smile:) as Dalton, symbol: Da

    (And in chemical engineering they like dimensionless numbers; one of them is the Damkohler number, with the symbol -- you guessed it! -- Da )
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