What is the difference between accuracy and precision in a practical experiment?

Accuracy refers to how close a measured value is to the true value, while precision indicates how consistently repeated measurements yield the same result. For example, if a scale shows 5.0 kg for a 5.0 kg weight, it is accurate; if it shows 5.0 kg repeatedly for multiple trials, it is precise. This answer is anchored to A-level practical endorsement.

Accuracy refers to how close a measured value is to the true value, while precision indicates how consistently repeated measurements yield the same result. For example, if a scale shows 5.0 kg for a 5.0 kg weight, it is accurate; if it shows 5.0 kg repeatedly for multiple trials, it is precise. is the best answer because it directly supports the AQA A-Level Chemistry objective to evaluate practical procedures using uncertainty, error, accuracy and precision. This reasoning is anchored to A-level practical endorsement in A-level practical endorsement and required practical activities, and it separates uncertainty from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.