Derived Units
18.1.2 Derived Units
Other SI measurement quantities are referred to as derived units and are expressed as products or quotients of the 7 base units. Certain derived SI units have special names and symbols and may be used in algebraic relationships to express other derived units. See the following tabulation.
Quantity |
Name |
SI Symbol |
Derivation From Base Unit |
|---|---|---|---|
Area |
square meter |
m2 |
m2 |
Volume |
cubic meter |
m3 |
m3 |
Speed, velocity |
meter per second |
m/s |
m/s |
Density, mass density |
kilogram per cubic meter |
kg/m3 |
kg/m3 |
Specific volume |
cubic meter per kilogram |
m3/kg |
m3/kg |
Concentration |
mole per cubic meter |
mol/m3 |
mol/m3 |
Frequency |
hertz |
Hz |
s−1 |
Force |
newton |
N |
kg · m · s−2 |
Pressure, stress |
pascal |
Pa |
kg · m−1 · s−2 (N/m2) |
Work, energy |
joule |
J |
kg · m2 · s−2 (N · m) |
Luminous flux |
lumen |
lm |
m2 · m−2 · cd = cd |
Power, radiant flux |
watt |
W |
m2 · kg · s−3 (J/s) |
Electric potential |
volt |
V |
m2 · kg · s−3 · A−1 |
Electric charge |
coulomb |
C |
A · s |
Electric resistance |
ohm |
Ω |
m2 · kg · s−3 · A−2 (V/A) |
Capacitance |
farad |
F |
m−2 · kg−1 · s4 · A2 (C/V) |
Magnetic flux |
weber |
Wb |
m2 · kg · s−2 · A−1 (V · s) |
Magnetic flux density |
tesla |
T |
kg · s−2 · A−1 (Wb/m2) |
Inductance |
henry |
H |
m2 · kg · s−2 · A−2 |