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one millimeter is equal to 0.1 centimeter.
tip of your pencil
Eight millimeters is equal to 0.31 inches. There are 24.4 millimeters in one inch and one millimeter is equal to 0.04 inches.
A sperm cell is only a fraction of a millimeter long. Typically a human sperm is about 5 microns long. A micron is equal to one one-thousandth of a millimeter.
One millimetre is equal to 1,000,000,000 picometres, and 1,000,000 nanometres.