Properties of Units

Description:

Each unit should have the following property −

Common size

The unit should have a size that is most commonly used while measuring a physical quantity.

If a common size is used, it makes the measurement easy and efficient.

Example − 1meter for length, 1kg for mass.

Well defined

The unit should be well defined so that it is independent of any other physical quantity and change in any other quantity should not affect the unit of measurement.

Hence, unit of measurement is always compared with speed of light so that it is well defined.

Invariable with time

The unit should not change with time i.e. unit of measurement for a physical quantity should be the same irrespective of time.

Possible to reproduce

The unit of measurement should be fixed in such a way that it should be easy to reproduce whenever required.