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GCSE Chemistry · key term
How close repeated measurements are to one another.
Used by OCR
Specification PAG 6, PAG 8 · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
How closely repeated measurements agree with one another.
Revise: General Apparatus and Measurement TechniquesClose agreement shows good precision, but repeated results can still all be inaccurate if the same problem, such as a gas leak, affects every run.
Repeated results that are close to one another.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
How close repeated measured values are to one another.
How close repeated measurements are to one another; precise results have little spread.
The closeness of repeated measurements to one another.
Support a judgement about precision with the spread or range of the repeat titres. Close agreement alone does not prove accuracy.
Keep the terms separate: precision concerns agreement between measurements, whereas accuracy concerns closeness to the true value.
Do not use accuracy and precision as synonyms. A tightly grouped set of readings can be precise but inaccurate.
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