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Density = Mass/Volume.

So in this case: density = 36/12 = 3 g cm-3. This is 3000 kg m-3 in SI units.

Also, watch your units. 12cm cubed is not the same as 12 cubic centimeters. 12 cm cubed is the volume of a cube 12 cm on each side, which is 1728 cubic centimeters. A density of 36 g ÷ 1728 cm3 is (to 4 significant digits) 1.736x10-3 g/cm3 or 1.736 kg/m3, which is just barely more than air.

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