Linked from
The 14 pages that link to Bulk density, each with the reason it gives.
PorosityRelated: Density measurements can help estimate porosity when solid-grain density is known.
PumiceRelated: Pumice’s many cavities reduce its bulk density below that of water in some specimens.
Soil physicsRelated: It indicates compaction and helps estimate total pore volume.
Kilogram per cubic metreRelated: Granular materials are often characterized in kg/m³.