SI Base Units as a System
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
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The International System defines seven base units, fixed by agreement, from which every other unit in chemistry is derived.
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The base units for length, mass, time, and temperature combine to build a derived unit like density, mass per volume.
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"SI units" is not the same as "metric units" in casual speech — SI is the standardized subset chemistry relies on.