Wikia

The SI Unit system (from the french Système international d'unités) forms the basis of standard measurements both within the sciences and the wider world. Each of the major physical quantities have a SI unit associated with their use, others, known as derived quantities, have their units formed from combinations of these base units, related to the formulae used to derive them.

Base UnitsEdit

There are seven quantities which have base units associated with them, these form the basis for every other SI unit in existance.

Quantity	SI Unit	Unit Symbol	Quantity Symbol
Length	metre	m	l
Mass	kilogram	kg	m
Time	second	s	t
Electrical Current	ampere	A	I
Temperature	kelvin	K	T
Amount of Substance	mole	mol	n
Luminous Intensity	candela	cd

Derived UnitsEdit

These units are SI units which may be derived from the equation(s) used in the calculation of the quantities associated with them. They are usually given seperate names and symbols in order to make their use easier.

Qunatity	Base Units	SI Unit	Unit Symbol	Quantity Symbol
Area	m²	Metres Squared	m²	A
Volume	m³	Metres Cubed	m³	V
Density	kg m^-3	Kilograms per Metre Cubed	kg m^-3	ρ
Velocity	m s^-1	Metres per Second	m s^-1	v
Acceleration	m s^-2	Metres per Second Squared	m s^-2	a
Momentum	kg m s^-1	Kilogram Metre per Second	kg m s^-1	p
Moment of Inertia	kg m²	Kilogram Metre Squared	kg m²	I, J
Angular Momentum	kg m² s^-1	Kilogram Metre Squared per Second	kg m² s^-1	L
Force	kg m s^-2	Newton	N	F
Energy or Work	kg m² s^-2	Joule	J	E, W
Power	kg m² s^-3	Watt	W	P
Pressure or Stress	kg m^-1	Pascal	Pa	p
Surface Tension	kg s^-2	Newton per Metre	N m^-1	γ
Visosity	kg m^-1 s^-1	Kilogram per Metre per Second	kg m^-1 s^-1	η
Frequency	s^-1	Hertz	Hz	ν, f

Wikia

SI Units

Base UnitsEdit

Derived UnitsEdit

Photos

Recent Wiki Activity