All those quantities which can be measured directly or indirectly and in terms of which the laws of Physics can be expressed, are called physical quantities. For example, length, mass, temperature, speed and force, electric current, etc.
`text(Units of Physical Quantities)`
Unit of any physical quantity is its measurement compared to certain basic, arbitrarily chosen, internationally accepted reference standard. There are several systems of units like CGS (Centimetre, Gram and Second), FPS (Foot, Pound and Second) and MKS (Metre, Kilogram and Second).
Physical quantities are of two types-
`(1) text(Fundamental Quantities)->` The quantities which do not depend upon other quantities for their complete definition are known as fundamental quantities or base quantities.
There are seven fundamental quantities - Length, Mass, Time, Electric Current, Temperature, Luminous Intensity, Amount of substance.
`(2) text(Derived Quantities)->` The quantities which can be expressed in terms of fundamental quantities are called derived quantities. e.g. speed, volume, force etc.
`text(Note :)` Other than fundamental and derived quantities there are two more quantities called as supplementary quantities. e.g. plane angle and solid angle.
All those quantities which can be measured directly or indirectly and in terms of which the laws of Physics can be expressed, are called physical quantities. For example, length, mass, temperature, speed and force, electric current, etc.
`text(Units of Physical Quantities)`
Unit of any physical quantity is its measurement compared to certain basic, arbitrarily chosen, internationally accepted reference standard. There are several systems of units like CGS (Centimetre, Gram and Second), FPS (Foot, Pound and Second) and MKS (Metre, Kilogram and Second).
Physical quantities are of two types-
`(1) text(Fundamental Quantities)->` The quantities which do not depend upon other quantities for their complete definition are known as fundamental quantities or base quantities.
There are seven fundamental quantities - Length, Mass, Time, Electric Current, Temperature, Luminous Intensity, Amount of substance.
`(2) text(Derived Quantities)->` The quantities which can be expressed in terms of fundamental quantities are called derived quantities. e.g. speed, volume, force etc.
`text(Note :)` Other than fundamental and derived quantities there are two more quantities called as supplementary quantities. e.g. plane angle and solid angle.