There are three types of physical quantities.

1. Fundamental physical quantities
2. Supplementary physical quantities
3. Derived physical quantities

 

The internationally accepted standard units and dimensions of the physical quantities are given below.

Fundamental physical quantities                    SI unit                Dimensions

 

• Mass                                                                    kg                             M
• Time                                                                     s                               T
• Length                                                                 m                               L

• Temperature                                                       K
• Electric current                                                   A
• Amuont of substance                                         mol
• Luminous intensity                                             Cd

 

Supplementary physical quantities

• Angle in a plane                                                  rd
• Solid angle                                                          Sr

 

Derived physical quantities

Physical quantity	Unit	Dimesion
Speed	ms-1	LT-1
Velocity	ms-1	LT-1
Acceleration	ms-2	LT-2
Pressure	kgm-1s-2 =Pa	ML-1T-2
Work	kgm2s-2=J	ML2T-2
Energy	kgm2s-2=J	ML2T-2
Power	kgm2s-3=W	ML2T-3
Frequency	s-1=Hz	T-1
Area	m2	L2
Volume	m3	L3
Density	kgm-3	ML-3

Pysical quantities which can be defined in terms of fundamental quantities are called derived quantities.