Question 169204
Convert 2.9g/cm^3 to milligrams per cubic millimeter.
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A millimeter is 1/10 of a centimeter, so a cubic centimeter (cc) is 10 mms on each side.  That means a cc is 10x10x10 cubic millimeters, = 1000 cubic millimeters.
If there are 2.9 g in a cc, there is 1/1000 of that in a volume that's 1/1000 of a cm^3.  See that?
So, 2.9g/cc is 0.0029g/mm^3.
It might seem difficult, but it's better than inches, feet, and 16ths of inches.
It's just moving the decimal point.