SI unit: The international system of units

The international system of units (abbreviated as SI) was established by the 11th General conference on weights and measures. The SI system has seven base units which pertain to seven fundamental scientific quantities. The other physical quantities such as speed, volume, density, etc. can be derived from these quantities. The SI system has seven base units which are listed as

Physical Quantity	Symbol for quantity	Name of Unit	Symbol for unit
Length	l	meter	m
Kilogram	m
Time	s
Temperature
Electric current	A
Luminous intensity	C
Amount of substance	Mole