Chemistry / Unit 1 Chem 0090 short lesson, about 20 seconds
SI Base Units as a System
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The idea
The International System defines seven base units, fixed by agreement, from which every other unit in chemistry is derived.
In practice
The base units for length, mass, time, and temperature combine to build a derived unit like density, mass per volume.
Where people slip
"SI units" is not the same as "metric units" in casual speech — SI is the standardized subset chemistry relies on.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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