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None, since there can be no conversion.

A milligram is a measure of mass. A millimetre 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.


Consider a millimetre of air. How many milligrams? Next consider the same volume of lead. How many milligrams?

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8y ago

What else can I help you with?