How many millimeters are in an inch? There are 25.4 millimeters in one inch. How many kilometers are in a mile? There are about 1.61 kilometers in a mile.
Units from the metric system can be used to describe the mass, volume or length of an object. Mass is measured in grams (g) and kilograms (kg). Volume is measured in millilitres (ml) and litres (l).
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