Weight difference of graphene vs copper?

  1. Aug 15, 2014 #1
    I know that graphene is a far more superb conductor than copper, but I'm trying to compare their weight difference. I mean, lets take an example: A copper busbar that is 7kg with resistance of 2 micro-Ω can carry a lot of current(in kA), I assume a much lighter(possible less than a kg) graphene conductor can conduct the same current range and is much much lighter?

    Trying to grasp more about this amazing material.
  2. jcsd
  3. Aug 15, 2014 #2
    You want specific resistivity: divide resistivity by density.

    This will give you a resistivity to weight ratio much like specific strength:


    If you divide resistivity by cost/kg you'll see one reason why copper is used as bus bars rather than graphene....
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