Pearson Science Double Award Practical 2: Measurement and Apparatus

Measurement quality depends on apparatus range, resolution, calibration, technique and the size of the quantity measured. Pearson embeds measurement decisions throughout 4SD0 written questions, so this cross-science note owns apparatus reasoning rather than repeating theory explanations.

Range, resolution, precision and accuracy

Range is the interval an instrument can measure. Resolution is the smallest displayed or marked change. Precision describes how closely repeated readings agree. Accuracy describes closeness to the accepted or true value. A set can be precise but inaccurate if every reading shares a zero offset.

Choose an instrument whose range safely contains the expected value and whose resolution is fine enough to distinguish meaningful changes. A $100\ \pu{cm3}$ measuring cylinder may suit approximate preparation, while a $10\ \pu{cm3}$ cylinder or pipette better resolves a small volume. Apparatus choice must fit the task, not merely be the most sophisticated available.