Definition Of Seven Fundamental Units Of SI System

 

 

Definition Of Seven Fundamental Units Of SI System

 

 (EdduLite)

       

                         Seven Fundamental Units Of SI system are Meter For Length, Kilogram for Mass, Second for Time, Ampere for Electric Current, Candela for Luminous Intensity, Kelvin for Temperature and Mole for Amount of Substance.

Meter :-

                 Total Distance travelled by light in vacuum in 1/299792458 second time is called 1 Meter.

Kilogram :-

                  The amount of the mass of a cylindrical alloy of Platinum-Iridium kept at International Bureau of Weight and Measure at Sever in France is called 1 Kilogram.

Second :-

                 In the transition of two hyper fine levels of energy in the ground state of an atom of cesium 133 by the means of radiation between an interval of 9192631770 time periods is called 1 Second.

Ampere :-

                  If two long parallel wires or coils are kept 1 meter apart through which an electric current is passed in such a way that it produces a magnetic force of 2*10^-7 Newton, then the magnitude of the electric current is called 1 Ampere.

Kelvin :-

                 In 273.16 K, Three phase of water means solid, liquid and vapour coexist in same way which is called triple point of water and this temperature is called critical temperature and its 1/273.16^th part is called 1 Kelven.   

Candela :-

                   In any monochromatic source of light produces a frequency of 540*10¹² Hz in definite direction and if its intensity is 1/683 watt/steradian, then it is called 1 candela. 

 (EdduLite)