The result of your conversion between grain/cubic foot and hectogram/cubic millimeter appears here
To convert between Grain/cubic Foot and Hectogram/cubic Millimeter you have to do the following:
First divide ((0.45359237/16)*(192/175)/480)/((0.0037854118/231)*1728) / 0.1/1.0E-9 = 0.
Then multiply the amount of Grain/cubic Foot you want to convert to Hectogram/cubic Millimeter, use the chart below to guide you.
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