| Basic
SI units |
| metre |
m |
| kilogramme |
kg |
| second |
s |
| kelvin |
K |
| ampere |
A |
| mole |
mol |
Remarks:
|
Unit,
dimension
|
Symbol
|
Do
not use
|
| micrometre |
µm |
µ |
| microgramme |
µg |
µ |
| minute* |
min |
min. |
| hour* |
h |
hr, hrs |
| day |
d |
– |
| degree Celsius (centigrade) |
°C (e.g.,
20 °C) |
° C (e.g.,
20° C) |
| pasqual |
Pa |
atm, torr, mmHg, bar |
| joule |
J |
cal, kWh |
| watt per metre square |
W m–2 |
cal cm–2
min–1 |
| molar, millimolar |
M, mM |
– |
| becquerel |
Bq |
Ci, C, c |
| counts per second |
s–1 |
cpm |
| hertz |
Hz |
c/sec |
| volume per volume |
cm3
m–3 |
vpm |
| mass per mass |
µg g–1 |
ppm |
| volume |
cm3, dm3 |
ml, l |
| mass per volume |
g dm–3 |
g/l |
*Do not use for scientific dimensions. The relevant unit is s (second).
| Common SI prefixes |
| 109 |
giga- |
G |
| 106 |
mega- |
M |
| 103 |
kilo- |
k |
| 10–2 |
centi- |
c |
| 10–3 |
milli- |
m |
| 10–6 |
micro- |
µ |
| 10–9 |
nano- |
n |
| 10–12 |
pico- |
p |
| 10–-15 |
femto- |
f |
|
