Chemistry / Unit 1 Chem 0086 short lesson, about 20 seconds
The Three Parts of a Measurement
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The idea
Every measurement carries three parts: a number giving magnitude, a unit giving the standard of comparison, and implied uncertainty.
In practice
Reporting a dose as "100 mg" states a magnitude and unit; the number alone could read as ten times intended.
Where people slip
Dropping the unit is not a shortcut — a bare number can be dangerously ambiguous, as with a dose in milligrams or grams.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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