Posted by GSU on Friday, February 10, 2012 at 6:52pm.
2.68 * 62.4 = 167 lbs/ft^3 if it were solid rock
so (167 - 100) = 67 pounds missing in voids
67 lb * 1 ft^3/167 lb = .4 ft^3 empty space
check .6 * 167 = 100
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