Soil weight is referred to as soil bulk density.
Density is the mass of material contained within a given volume.
This is the idea that a given size of box may be heavy or light, depending upon what kind of material it contains. If the box were filled with pinewood, it would be light when compared to having it filled with lead. Tillage and Bulk Density Relationships and Compaction Soil Consistency - definitions for various kinds of consistency. Any of the problems in this unit can be expected to be on the exam. The University of Minnesota is an equal opportunity educator and employer.