Mass It is the quantity of mattercontained in a body. Its S.J. unit is kilogram (kg) It is constant for a body and it does not change by changing the place of the body. It is measured by a beam balance. Weight It is the force with which the earth attracts the body. Its S.I. unit is newton (N) and other unit is kilogram-force (kgf) where 1 kgf= 1ON(nearly). It is not constant for a body, but it changes from place to place. It is measured by a spring balance.
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