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Is kg an SI unit?
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Yes, the kilogram (kg) is an SI (International System of Units) unit. It is the SI base unit of mass. It's one of the seven fundamental units in the SI system, and it is the only unit that is still defined by a physical object (in the past, it was defined by a platinum-iridium cylinder, but now it's defined using fundamental constants of nature, like the Planck constant).
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