The Picometre reference article from the English Wikipedia on 24-Jul-2004
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Picometre

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Picometre (American spelling: picometer) is an SI measure of length that is equal to 10−12 of a metre.  Its symbol is pm and it is commonly used in measuring atomic-scale distances.  Atom diameters are in the range from ~30 to 600 pm.

1 pm = 1 × 10−12 metre
1 pm = 1000 femtometre
100 pm = 1 ångström
1000 pm = 1 nanometre

See also:
1 × 10−12 metre

femtometre << picometre << nanometre

External link

Conversion Calculator for Units of LENGTH