Metric System and SI Units


The metric system preceeded the SI System. The two systems have different basic units.

The metric system has the basic units of


Measurement Metric Unit Abbreviation
length meter m
mass gram g
time second s
electric current ampere A
temperature Kelvin K
amount of substance mole mol
luminous intensity candela cd



The SI system has the basic units of:

Measurement SI Unit Abbreviation
length meter m
mass kilogram kg
time second s
electric current ampere A
temperature Kelvin K
amount of substance mole mol
luminous intensity candela cd