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The 11th Conférence Générale des Poids et Mesures (CGPM),

considering

• Resolution 6 of the 10th CGPM, by which it adopted six base units on which to establish a practical system of measurement for international use:

length	metre	m
mass	kilogram	kg
time	second	s
electric current	ampere	A
thermodynamic temperature	degree Kelvin	°K
luminous intensity	candela	cd

• Resolution 3 adopted by the Comité International des Poids et Mesures (CIPM) in 1956,
• the recommendation adopted by the CIPM in 1958 concerning an abbreviation for the name of the system, and prefixes to form multiples and submultiples of the units,

decides

1. the system founded on the six base units above is called the "Système International d'Unités";
2. the international abbreviation of the name of the system is SI;
3. names of multiples and submultiples of the units are formed by means of the following prefixes:




Multiplying factor			Prefix	Symbol		Multiplying factor			Prefix	Symbol
1 000 000 000 000	= 1012		tera	T		0.1	= 10–1		deci	d
1 000 000 000	= 109		giga	G		0.01	= 10–2		centi	c
1 000 000	= 106		mega	M		0.001	= 10–3		milli	m
1 000	= 103		kilo	k		0.000 001	= 10–6		micro	µ
100	= 102		hecto	h		0.000 000 001	= 10–9		nano	n
10	= 101		deca	da		0.000 000 000 001	= 10–12		pico	p



4. the units listed below are used in the system, without excluding others which might be added later.

Supplementary units

plane angle	radian	rad
solid angle	steradian	sr

Derived units

area	square metre	m2
volume	cubic metre	m3
frequency	hertz	Hz	1/s
mass density (density)	kilogram per cubic metre	kg/m3
speed, velocity	metre per second	m/s
angular velocity	radian per second	rad/s
acceleration	metre per second squared	m/s2
angular acceleration	radian per second squared	rad/s2
force	newton	N	kg · m/s2
pressure (mechanical stress)	newton per square metre	N/m2
kinematic viscosity	square metre per second	m2/s
dynamic viscosity	newton-second per square metre	N · s/m2
work, energy, quantity of heat	joule	J	N · m
power	watt	W	J/s
quantity of electricity	coulomb	C	A · s
tension (voltage), potential difference, electromotive force	volt	V	W/A
electric field strength	volt per metre	V/m
electric resistance	ohm		V/A
capacitance	farad	F	A · s/V
magnetic flux	weber	Wb	V · s
inductance	henry	H	V · s/A
magnetic flux density	tesla	T	Wb/m2
magnetic field strength	ampere per metre	A/m
magnetomotive force	ampere	A
luminous flux	lumen	lm	cd · sr
luminance	candela per square metre	cd/m2
illuminance	lux	lx	lm/m2

The reader should note that the official version of this Resolution is theFrench text.