The thickness will be measured in millimeters.
Unit conversion is a way of converting some common units into another without changing their real value. for, example, 1 centimeter is equal to 10 mm, though the real measurement is still the same the units and numerical values have been changed.
1 meter = 1000 millimeter.
1 centimeter = 10 millimeter,
1 kilometer = [tex]10^6[/tex] millimeter
We know that the thickness of the coin is too little. To be measured in meters or kilometers, therefore, the thickness will be measured in millimeters.
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