Bulk density

Bulk density is the mass of powder divided by the volume it occupies before any compaction, including the voids between particles.

1. 1Weigh a known mass of representative powder (for example 50–100 g).
2. 2Pour it gently into a dry graduated cylinder (100 or 250 mL) without compacting it.
3. 3Level the surface carefully without pressing.
4. 4Read the unsettled (bulk) volume.
5. 5Calculate: Bulk density = mass ÷ bulk volume.
6. 6Record results and notify QA if outside specification.