Describe old description of mass and new description of mass
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Old method: Si unit of mass is Kilogram. ! kilogram is defined as the mass of a platinum-iridium cylinder kept in Paris.
New Method: the mass of 1 litre of water at 4 degree celcius is exactly equals to 1 kilogaram. 1 kilogram is equal to the mass of 5.0188x 10^25 atoms of 6C12(an isotope of carbon).
Explanation:
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