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

Chemistry - Main Course Book I

Chapter 1. Some Basic Conpepts of Chemistry


The kilogram is the SI base unit of mass and is equal to the mass of the international prototype of the kilogram, a platinum-iridium standard that is kept at the International Bureau of Weights and Measures (BIPM
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The SI of a mass is kg. one kilograms (kg) is defined as the mass equal to the mass of international prototype of kilogram.
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