Cubic inches = pi*r^2*L wherer = radius of rod = 1/2*diameter and L = length, both measured in inches.
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Probably meant cubic inches... start with the density of stainless steel. Of course that depends on the consist of the steel... let's just use a nice round number like 8000 kg/cubic meter. Convert cubic meters into cubic inches using conversion factors: 8000 kg/m3 * (1/39.37 in/m) (1/39.37 in/m) (1/39.37 in/m) = 8000 kg/m3 * (1/61023.377953 in3/m3) ~ 0.131 kg/in3 That's the number of kilograms per cubic inch. To find the number of cubic inches per kilogram, merely invert: 1/0.131 kg/in3 ~ 7.628 in3/kg So, around 7.628 cubic inches are in 1 kilogram of stainless steel.
In what amount of time?
The US one-cent coin is 0.750 inches in diameter and 0.061 inches thick,for a volume of 0.027 cubic inches.The UK plated-steel penny (one new pence) is 20.32 mm in diameter and 1.65 mm thick, for a volume of 0.535 cm3 or about 0.033 cubic inches.(see related question)
Steel is typically 490 lb/cubic foot. There are 1,728 square inches in a cubic foot which means that each cubic inch weighs about .284 pounds (just a bit over a quarter of a pound per square inch).
3.14159 x radius squared x thickness x .283 (weight of 1 cubic inch of steel)