SI prefixes
SI units may be combined with prefixes to denote multiplication by a power of 10.
You need to know most of these prefixes, certainly those in bold in the table.
e.g. 1 µm = 1×10–6 m, e.g. 5 MW = 5×106 W.
10-1 |
deci |
d |
101 |
deca |
da |
|
10-2 |
centi |
c |
102 |
hecto |
h |
|
10-3 |
milli |
m |
103 |
kilo |
k |
|
10-6 |
micro |
µ |
106 |
mega |
M |
|
10-9 |
nano |
n |
109 |
giga |
G |
|
10-12 |
pico |
p |
1012 |
tera |
T |
|
10-15 |
femto |
f |
1015 |
peta |
P |
|
10-18 |
atto |
a |
1018 |
exa |
E |
|
10-21 |
zepto |
z |
1021 |
zetta |
Z |
|
10-24 |
yocto |
y |
1024 |
yotta |
Y |