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GCSE Chemistry · key term
The smallest change in a quantity that a measuring instrument can distinguish.
Used by AQA, Edexcel and OCR
Specification 4.3.1.4 · Paper 1
The smallest change that a measuring instrument can distinguish.
Revise: Measurement UncertaintyA balance, thermometer or measuring cylinder has a limited resolution, and it may be difficult to judge a scale between two markings. The recorded value is therefore an estimate rather than a guarantee of the exact value.
Paper 1, Paper 2
The smallest change in a quantity that a measuring instrument can display.
Specification PAG 6 · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: General Apparatus and Measurement TechniquesResolution is the smallest change an instrument can distinguish. A digital display with small increments helps you read small changes, but it does not guarantee accuracy: poor technique can still give an incorrect result.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The smallest change in a quantity that a measuring instrument can show.
Revise: Apparatus and techniquesSuitable apparatus must have an appropriate range and resolution. It must also be safe and physically or chemically suitable for the substance involved.
If the masses differ only slightly, compare the difference with the balance resolution and consider uncertainty, spillage or material left behind.
Recording more decimal places does not make a measurement more accurate. Use the resolution of the apparatus.
When justifying apparatus, name the property that makes it suitable: for example, its resolution, measuring range or ability to contain the substance safely. Do not merely say that it is “more accurate”.
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