One millimetre is equal to 1,000,000,000 picometres, and 1,000,000 nanometres.
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1 micrometre = 1000 nanometres so 1000 micrometres = 1 million nanometres
1,000,000,000 (10^9) nanometres is 1 metre. Which means that 100 nanometres is 1 part of 10,000,000 of a metre.
1 milimetre is equal to 0.001 metre
So, a meter is the biggest, a centimeter is smaller, and a millimeter is the smallest. Meter to millimeter? 1 meter = 1000 millimeter 1 millimeter = 0.001 meter.
A millimeter