C.2.5—Logarithmic quantities

Use logarithms for quantities spanning several orders of magnitude and interpret real-world logarithmic scales.

Use c.2.5—logarithmic quantities to connect the rule to the data and decision in the question.

This matters because c.2.5—logarithmic quantities determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply c.2.5—logarithmic quantities to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: C.2.5—Logarithmic quantities is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.