Using these base units, scientist can devise a system of units which can be used to measure all other quantities. These are called the derived units. For example, the speed of your car shown in the dash board is measured in kilometers per hour.
|
Derived quantity |
Unit |
Symbol for unit |
|
frequency |
hertz |
Hz |
|
angle |
radian |
rad |
|
area |
meter2 |
m2 |
|
volume |
meter |
m3 |
|
density |
kiligram per meter3 |
kg m-3 |
|
velocity |
meter per second |
m s-1 |
|
acceleration |
meter per second2 |
m s-2 |
|
momentum |
kilogram meter per second |
kg m s-1 |
|
force |
newton |
N |
|
pressure |
pascal |
Pa |
|
energy |
joule |
J |
|
power |
watt |
W |
|
electric charge |
coulomb |
C |
|
potential difference |
volt |
V |
|
resistance |
ohm |
W |
|
capacitance |
farad |
F |
