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0.283 lb. per cubic inch
Gray cast iron is around 118 grams per cubic inch.
1 cubic inch of water weighs 16.4 (16.3961) grams.
At the heart of a black hole, a cubic inch of material would weigh an infinite amount.
The square inch is a unit of area. The cubic inch is a unit of volume; a cubic inch of uranium has a mass of approx. 312,2 grams.
Density of uranium: 19,1 g/cm3 1 cubic inch = 16,38706 cm3 The mass of 1 cubic inch of uranium is 313 g.
Of course, different brasses and forms can vary, but at a specific gravity of about 8.5, a cubic inch of brass would weigh about 5 ounces (or just under a third of a pound).
The density of ununoctium is not known.
once cubic inch of plutonuim is about 715 pounds 1 cubic inch = 16,387 06 cm2 Density of plutonium: 19,816 g/cm3 The weight of 1 cubic inch of plutonium = density x volume = 324,726 grams
The density of lead is 11.34g per cubic centimetre. As there are 16.387 cubic centimetres in one cubic inch, one cubic inch of lead weighs 11.34 X 16.387 or 185.83grams. In ounces this is 6.55 (or just over 6 and a half) ounces.
The density of limestone varies from something on the order of 110 pounds per cubic foot (a shade over 1 ounce per cubic inch) to over 160 pounds per cubic foot (about 1.5 ounces per cubic inch).
There are SO MANY kinds of 'plastic' that's an impossible question.