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1 meter = 1,000 millimeters0.3 meters = 300 millimeters
1 gram is 100 centigrams
1 inch = 25.4 mm 3 inch = 3 x 25.4 mm
The milli- prefix means one thousandth (1/1000), so there are 1000 mg in 1 g.
Only if it is water, which has a mass of 1gram per ml volume