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Derived SI Units
Additional units may be derived from SI base units. This is done by using
the base unit in equations that define other physical quantities. For example,
volume has the unit (length)3. The unit of volume is an example of
an SI derived unit, which is a unit
derived by combining SI base units. the following table defines a number of
derived units, several of which are used in chemistry.
Derived units
| Quantity |
Definition of Quantity |
Symbol |
| Area |
Length squared |
m2 |
| Volume |
Length cubed |
m3 |
| Density |
Mass per unit volume |
kg m-3 |
| Speed |
Distance traveled per unit time |
m s-1 |
| Acceleration |
Speed changed per unit time |
m s-2 |
| Force |
Mass times acceleration of object |
kg m s-2 (N) |
| Pressure |
Force per unit area |
kg m-1 s-2 (Pa) |
| Energy |
Force times distance traveled |
kg m2 s-2 (J) |
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