Kilogram is the fundamental unit of mass and it is equal to 2.205 pound(lb). First it was defined as mass of 1 litre (cm^3) water which was then modified in 1889, as a cylinder made of 90% Platinum and 10% Iridium named as an International Prototype of the Kilogram (IPK). In 2019, a kilogram was redefined in terms of three fundamental physical constants:

1: Speed of Light 'c'

2: Specific Atomic Transition Frequency '∆Vcs'

3: Planks Constant 'h'

It is now defined as taking the fix numerical value of planck constant h to be 6.626*10^-34 when expressed in J.s which is equal to kg.m^2.s.-1, where metre and second are defined in terms of 'c' and '∆Vcs' res.

This definition makes kilogram consistent with the older definition : the mass remains within 30 PPM of the mass of 1 litre of water.

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