1. A physical quantity is a quantity that can be measured.
2. A physical quantity can be divided into base quantity and derived quantity.
Base Quantities
1. Base quantities are the quantities that are conventionally accepted as functionally
independent of one another.
2. It is a quantity that cannot be defined in term of other physical quantity.
3. The base quantities and its units are as in the table below:
| Quantity | Name of Unit | Unit symbol |
|---|---|---|
| Length | metre | m |
| Mass | kilogram | kg |
| Time | second | s |
| Electic current | ampere | A |
| Temperature | Kelvin | K |
Derived Quantities
A derived quantity is a Physics quantity that is not a base quantity. It is the quantities which derived from the base quantities through multiplying and/or dividing them.
For example:
Derived Unit
The derived unit is a combination of base units through multiplying and/or dividing them.
Prefixes
Prefixes are the preceding factor used to represent very small and very large physical quantities in SI units.
Click these links! Check them out:
http://physics.nist.gov/cuu/Units/units.html
http://physics.nist.gov/Pubs/SP811/sec04.html
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