Units of SI system

SI (System-International) system consists of 7 Basic Units

Unit	SI name	SI symbol
length	metre	m
mass	kilogramme	kg
time	second	s
electric current	Ampere	A
temperature difference	Kelvin	K
luminous intensity	candela	cd
quantity of substance	mole	mol

From the basic units, Derived units are defined

Unit	SI name	SI symbol	Relationship	SI basic units
frequency	hertz	Hz		s-1
speed, velocity				m / s
plane angle	radian	rad		m x m-1 = 1
angular velocity			rad / s	s-1
acceleration				m / s2
angular acceleration			rad / s2	s-2
area				m2
volume				m3
mass density				kg / m3
specific volume				m3 / kg
force	newton	N		kg x m x s-2
work, energy, heat	joule	J	N x m	m2 x kg x s-2
pressure, stress	pascal	Pa	N / m2	m-1 x kg x s-2
power	watt	W	J / s	m2 x kg x s-3
electric potential difference, EMF	volt	V	W / A	m2 x kg x s-3 x A-1
electric resistance	ohm	Ω	V / A	m2 x kg x s-3 x A-2
electric conductance	siemens	S	A / V	m-2 x kg-1 x s3 x A2
current density				A / m2
electric charge	coulomb	C		s x A
capacitance	farad	F	C / V	m-2 x kg-1 x s4 x A2
magnetic flux	weber	Wb	V x s	m2 x kg x s-2 x A-1
magnetic flux density	tesla	T	Wb / m2	kg x s-2 x A-1
magnetic field strength				A / m
inductance	henry	H	Wb/ A	m2 x kg x s-2 x A-2
Celsius temperature	degree Celsius	°C		K

Prefixes for Multiplication Factors

Multiplication factor	Prefix	SI symbol
1012	tera	T
109	giga	G
106	mega	M
103	kilo	k
102	hecto	h
101	deca	da
10-1	deci	d
10-2	centi	c
10-3	milli	m
10-6	micro	µ
10-9	nano	n
10-12	pico	p