Système International (SI) Units

A universal, unified, self-consistent system of measurement units based on the MKS (meter-kilogram-second) system. The international system is commonly referred to throughout the world as SI, after the initials of Système International.

Measure of	Base SI Unit	Symbol
Length	meter	m
Mass	kilogram	kg
Time	second	s
Electric current	ampere	A
Thermodynamic Temperature	kelvin	K
Amount of substance	mole	mol
Luminous intensity	candela	cd

Derived SI Units
Measure of	Unit	Symbol
Area	square meter	m2
Volume	cubic meter	m3
Velocity	meter per second	m/s
Acceleration	meter per second squared	m/s2
Density	kilogram per cubic meter	kg/m3
Current density	ampere per square meter	A/m2
Magnetic field strength	ampere per meter	A/m
Specific volume	cubic meter per kilogram	m3/kg
Luminance	candela per square meter	cd/m2
Measure of	Unit	Symbol	Value
Frequency	hertz	Hz	1/s
Force	newton	N	kg m/s2
Pressure, stress	pascal	Pa	N/m2
Energy, work, qty of heat	joule	J	N m
Power	watt	W	J/s
Qty of electricity	coulomb	C	A s
Electric potential	volt	V	W / A
Capacitance	farad	F	C / V
Electric resistance	ohm		V / A
Conductance	siemens	S	A / V
Magnetic flux	weber	Wb	V s
Inductance	henry	H	Wb / A
Luminous flux	lumen	lm	cd sr
Illuminance	lux	lx	lm / m2
Activity (of radionuclides)	becquerel	Bq	1/s
Absorbed dose	gray	Gy	J/kg