give classification of unit with example

Classification of units :-   (i ) Fundamental units  and (ii) derived units 

 

(i) Fundamental units are  given in table below

 

Quantity	Units
Distance	Metre  ( m )
Mass	kilogram ( kg )
Time	seconds ( s)
Temperature	Kelvin ( K )
Current	Ampere ( A )
Luminance	Candela ( Ca )
Amount of substance	Mole  ( mole)

 

 

(ii) Derived units are expressed in terms of fundamental units 

 

Quantity	Units
Area = Length × Length	m2
Volume = Length × Length × Length	m3
Density = mass / volume	kg / m3
speed = distance / time	m / s
acceleration = change in speed / time	m / s2
Force = mass × acceleration	N = kg m /s2
Workdone = force × distance	J = N × m