The reduction of voids in soil material results in which of the following changes?

The reduction of voids in soil material leads to an increase in the unit weight of that material. When the voids or empty spaces between soil particles decrease, the soil becomes denser. This densification means that for the same volume of soil, there is a greater mass of solid particles, which translates to a higher unit weight.

In geotechnical engineering, unit weight is an important property because it affects the stability of soil structures and their load-bearing capacity. As voids fill up, whether with water or as the soil is compacted, the effective weight of the soil material increases. This principle is fundamental to understanding soil behavior under load and is critical when designing and analyzing foundations, slopes, and other earthwork applications.