Chemistry › Section A · Essential ideas › Topic A.5
Uncertainty, significant figures, and unit conversions
No measurement is perfect, and an answer should never claim more certainty than the data behind it. Significant figures keep results honest, and dimensional analysis lets units guide every conversion and calculation.
In this topic
- Exact numbers and measured numbers
- Reading a scale: significant figures
- Which zeros count
- Rules for calculated results
- Worked example: density of a liquid
- Accuracy and precision
- Worked example: judging three data sets
- Dimensional analysis
- Worked example: a speed in new units
- Converting temperatures
- Common mistakes to avoid
- Key takeaways
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