SI prefixes
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As explained in Introduction to SI units, a
prefix may be added to a SI base unit that indicates the exponent (power base
ten) to apply to the base unit. The prefixes are set out below. In case you
can’t easily remember these prefixes, the table also contains links to the
corresponding Nematrian conversion functions that you can use to convert units
with a prefix to base units or vice versa:
|
Prefix
|
Symbol
|
Factor
|
|
yotta
|
Y
|
|
|
zetta
|
Z
|
|
|
exa
|
E
|
|
|
peta
|
P
|
|
|
tera
|
T
|
|
|
giga
|
G
|
|
|
mega
|
M
|
|
|
kilo
|
k
|
|
|
hecto
|
h
|
|
|
deca*
|
da
|
|
|
deci
|
d
|
|
|
centi
|
c
|
|
|
milli
|
m
|
|
|
micro
|
|
|
|
nano
|
n
|
|
|
pico
|
p
|
|
|
femto
|
f
|
|
|
atto
|
a
|
|
|
zepto
|
z
|
|
|
yocto
|
y
|
|
* In the US spelt “deka”
An exception is the kilogram (spelt kilogramme in some
locations), the SI base unit for mass, which for historical reasons already
includes a ‘kilo’ prefix. Prefixes for it are formed by adjusting this prefix
and applying it to the gram.
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