The metric unit of mass that is equal to 1/1000 is:
What is the Milligram?
The milligram is a convention for measuring mass. Mathematicians agree that the milligram is equal to 0.0001 gram. This is the same thing as 1/1000 grams.
The gram is the base from which the milligram and other standards are obtained in the metric units for the measurement of mass.
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