The SI units

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The SI units

Posted by Boigou Khongsai 4 years, 3 months ago

CBSE > Class 11 > Physics

2 answers

Harshree Saraf 4 years, 2 months ago

The seven SI base units, which are comprised of: Length - meter (m) Time - second (s) Amount of substance - mole (mole) Electric current - ampere (A) Temperature - kelvin (K) Luminous intensity - candela (cd) Mass - kilogram (kg)

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Gaurav Seth 4 years, 3 months ago

The International System of Units (SI units)

The SI units has seven base units and all the other are derived from these seven base units and are called derived units

Base Physical quantity	Symbol	SI units
Length	l	Meter (m)
Mass	m	Kilogram(kg)
Time	t	Sec(s)
Temperature	T	Kelvin(K)
Electric current	I	Ampere(A)
Amount of Substance	N	Mole(M)
Luminous intensity	I_v	Candela(cd)

Speed, Volume, density can be derived from these base Units.Some Common Physical quantity and their derived units

Physical Quantity	Symbol	Name	Unit
Mass	m , M	kilogram	kg
Linear position Length, Distance Radius	x, r l, d R	meter	m
Time	t,	second	s
Area	A	-	m²
Volume	V	-	m³
Density		-	kg/m³
Linear velocity	v, u, c	-	m/s
Linear momentum	p	-	kg*m/s
Linear acceleration	a	-	m/s²
Force	F	newton	N=kg*m/s²
Impulse	I	-	N*s
Work Energy	W E	joule	J=N*m
Power	P	watt	W=J/s

SI Unit system allow the use of prefix to show multiples or sub multiple of units

Prefixes in SI system Multiple	Prefix	Symbol
10^-12	pico	p
10^-9	nano	n
10^-6	micro	μ
10^-3	milli	m
10^-2	centi	c
10^-1	deci	d
10	deca	da
10²	hecto	h
10³	kilo	k
10⁶	mega	M
10⁹	giga	G
10¹²	tera	T