Measurement of Mass

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While dealing with atoms and molecules, the kilogram is an inconvenient unit. In this case, there is an important standard unit of mass, called the unit

It is the (1/12) th  of the mass of an atom of - 12 isotope

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Range of mass may vary from tiny mass of the order of 10 -30 kg of an to the huge mass of about 10 55 kg of the known

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