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You do not.

A milligram is a measure of mass. A millilitre is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.

If you are not convinced, consider 4 milligrams of air. How many millilitres? Next consider 4 milligram Mercury. How many millilitres?

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13y ago

What else can I help you with?