Key term for OCR GCSE Chemistry A, used in Properties of materials.
Airborne particles with diameters between 100 nm and 2,500 nm (1 × 10⁻⁷ m to 2.5 × 10⁻⁶ m).
Fine particles (PM₂.₅) appears in OCR GCSE Chemistry A revision content for Elements, compounds and mixtures, especially Properties of materials and Nanoscale Dimensions.
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