A picometre is a measurement. It is one millionth of a millionth of a metre. It is also one billionth of a millimetre. This is very small. Many atoms are larger than this. A picometer is 1×10−12 m (1 / 1,000,000,000,000 m). 1 picometer equals 0.001 nanometre , 0.01 angstrom or 1000 femtometre.
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