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A.0.1—Units in calculations

Syllabus
2021
Objective
Level
A2

Keep biological calculations dimensionally consistent

Write the quantity, unit and time or area basis before calculating. Convert units first, then substitute values and report a final answer with the correct magnitude and significant figures.

Convert cm³ to dm³ only after identifying the required output; a cardiac output of 3,750 cm³ min⁻¹ is 3.75 dm³ min⁻¹.

A numerically plausible answer with incompatible units is still wrong.

ConceptA-Level Edexcel Biology A2