Chemistry / Unit 1 Chem 0147 short lesson, about 20 seconds
Precision
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The idea
Precision describes how closely repeated measurements of the same quantity agree with one another, regardless of whether they are correct.
In practice
A dispenser that fills bottles at 283.3, 284.1, and 283.9 mL every time is precise, because the values cluster tightly together.
Where people slip
"Precise" and "accurate" are routinely treated as the same word; a set of tightly clustered results can still be consistently wrong.
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