Why are the kilogram, ampere, kelvin, and mole still considered base units and not derived? Given their current definitions, they're purely defined in terms of other units and cannot be independently measured, right?
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Base means here it cannot be derived from other units alone. kg is defined in terms of m and s AND h. If h weren't "injected" into the definition then it'd be a derived unit.
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It's a multiplier needed to keep the new definition backwards compatible.
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So why does this multiplier make it a base unit, but multipliers used for derived units do not? Does a unit become a base unit if the multiplier used in its definition is something other than a whole integer?
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