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Picometre
The
picometre
(International spelling as used by the
International Bureau of Weights and Measures
;
SI
symbol:
pm
) or
picometer
(American spelling) is a
unit
of
length
in the
metric system
, equal to one trillionth (i.e.,
1
/
1,000,000,000,000
) of a
metre
, which is the
SI
base unit
of length. It can be written in
scientific notation
as 1×10
-12
m, in
engineering notation
as , and is simply .
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