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What is the SI unit of mass? How is it d...

What is the SI unit of mass? How is it defined?

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SI unit of mass is kilogram (kg). It is equal to the mass of international prototype of the kiloggram. It is defined as the mass of a platinum-iridium (Pt-Ir) cylinder stored in an air-tight jar at the international bureau of weights and measures in france.
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CHHAYA PUBLICATION-SOME BASIC CONCEPTS OF CHEMISTRY-SOLVED NCERT EXERCISE
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