Some other units (which are not part of the SI system) can be used in conjunction with SI units; common ones are listed in the table below. They include some units that are widely used in science.
Common units accepted for use with SI unitsa
| Unit |
Symbola |
|
minute
|
min
|
|
hour
|
h
|
|
day
|
d
|
|
degree (angle)
|
°
|
|
minute (angle)
|
'
|
|
second (angle)
|
"
|
|
litre
|
L
|
|
tonne (metric ton)
|
t
|
|
electron volt
|
eV
|
|
angstromb
|
Å
|
|
barb
|
bar
|
|
curieb
|
Ci
|
|
hectareb
|
ha
|
|
knotb
|
knot
|
|
radb
|
rad
|
|
remb
|
rem
|
|
roentgenb
|
R
|
|
nautical mileb
|
n mile
|
a Only the more common units are listed here; for a more detailed listing, including further details on when it is appropriate to use these symbols, see the Council of Science Editors Scientific style and format.
b These units are permitted but not encouraged within the SI system.
Other commonly used non-SI units and symbols are listed in the table below.
Other commonly used units
| Unit |
Symbola |
|
acidity or alkalinity of an aqueous solution
|
pH
|
|
molarity
|
M
|
|
molality
|
m
|
|
normality
|
N
|
|
percentage
|
%
|
|
dollar
|
$ (see Currency)
|
a Shows correct capitalisation and italics
Some other units, not recognised within the SI system, are legally recognised in Australia. They include decibel (dB), metric carat (CM or ct), stokes (St) and poise (P).
