-Units of the SI System
The kilogram (kg), for mass.
The second (s), for time.
The kelvin (K), for temperature.
The ampere (A), for electric current.
The mole (mol), for the amount of a substance.
The candela (cd), for luminous intensity.
The meter (m), for distance.
-The need for various systems of measuring values has come from the nature of the property to be measured and the objectivity in quantifying it. This means that the same quantity can be represented by different scales based on several factors.
Hope it helps.
