The result of your conversion between gram/liter and grain/quart [UK] appears here
To convert between Gram/liter and Grain/quart [UK] you have to do the following:
First divide 0.001/0.001 / ((0.45359237/16)*(192/175)/480)/(0.00454609/4) = 17.5392225
Then multiply the amount of Gram/liter you want to convert to Grain/quart [UK], use the chart below to guide you.
Symbol: g/l
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Symbol: gr/qt
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