It's the airspace between the individual pieces.
I can fit 50 lbs of bare bright into a 12"x12"x6" box with all of the individual strands being straight and laid together neatly.
I can fit 50lbs of brass into the same 12x12x6 box because the metal is denser.
I need a 12"x12"x12" box for 50 lbs of motor windings cause the strands go every which way and there's a lot more air space between the individual strands.
I'll try the plumbing copper in the same 12x12x12 box this weekend and see how it goes.
Edited to add: I did up the plumbing copper and it was the same as the motor windings.
Six of one or half dozen or another ... it's the same density and weight.
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