The density of brass typically ranges from about 8.4 to 8.7 grams per cubic centimeter. To convert this to grams per cubic inch, you can use the conversion factor of 1 cubic inch being approximately 16.387 cubic centimeters. Thus, the density of brass is approximately 0.485 to 0.530 grams per cubic inch.
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The density of aluminum is approximately 2.7 grams per cubic centimeter (g/cm³). Since there are 16.387 cubic centimeters in a cubic inch, the density of a cubic inch of aluminum is about 43.6 grams. This value can vary slightly depending on the specific alloy and purity of the aluminum.
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Amorphous polypropylene has a density of 0.855 gm/cm3. To convert to gm/cubic inch, 0.855 gm/cm3x16.39 cm3/cubic inch = 14.0 gm/cubic inch
The volume of the little cube is 23 = 8 cubic inches so the density of the material is 8/20 = 0.4 grams per cubic inch.The volume of the large cube is 83 = 512 cubic inches, so the mass (not the weight) is 512*0.4 = 128 grams.
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).