The weight of a cubic foot of carbon will vary depending on which allotrope of carbon we are considering. Carbon comes in different "flavors" depending on what we care to look at. Carbon appears as graphite in lead pencils, or as diamond, that sought-after crystal. It has a couple of other forms. Let's look at the two common ones. Diamond has a density of about 3.515 grams per cc, and graphite has a density of about 2.05 grams per cc. With some conversion factors, we can find that: Diamond - about 219.24 pounds per cubic foot Graphite - about 127.86 pounds per cubic foot
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1 ft^3 = 12in * 12in * 12in = 1728in^3
Density of steel: 0.283lb/in^3
1728in^3 * 0.283lb/in^3 = 489.024lb
It depends on the metal. One cubic foot of Lead would weigh a great deal more then one cubic foot of Magnesium.
One possibility:
1 cubic foot = 1 ft*1 ft*1 ft (length, breadth and height respectively)
Weight measures the pull of gravity on the mass of body and cubic foot measures volume. You cannot convert the weight of anything to cubic feet.