What is the term used for the weight of soil per unit volume?

The term used for the weight of soil per unit volume is soil density. This concept is fundamental in soil mechanics and geotechnical engineering as it helps engineers understand the behavior of soil under various load conditions. Soil density can be expressed as either bulk density, which includes the total weight of the soil (solids and pore spaces), or specific density, which refers strictly to the soil solids.

Understanding soil density is crucial for determining the load-bearing capacity of the soil, assessing compaction levels, and evaluating moisture content in constructions. While the other terms also relate to soil and its properties, none specifically captures the idea of weight per unit volume as accurately and directly as soil density does. Soil volumetrics might refer to broader measures that include volume-related calculations, while soil weight and soil mass do not specifically describe the relationship between weight and volume, which is the essence of density.