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Zepto-
Zepto
is
a unit
prefix
in the
metric system
denoting a
factor of 10
−21
or.
Adopted
in
1991
, it
comes
from the
Latin
septem
, meaning "seven", since it is
equal to
1000
−7
.
Examples
of its use:
The
electric charge
on one electron:
160
.217657 zeptocoulombs.
One zeptomole of
substance
contains
602
particles
.
The
human insulin
molecule
has a mass of
roughly
10
zeptograms.
