1.4.23 - Density

Use density ρ = m/V.

Use - density to connect the rule to the data and decision in the question.

This matters because - density determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply - density to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: - Density is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.